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Equipment & Gear => Guns and Ammo => Topic started by: D-Rock425 on March 24, 2011, 06:34:33 PM


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Title: sighting in. how high at 100 yards?
Post by: D-Rock425 on March 24, 2011, 06:34:33 PM
I might go sight in my new rifle this weekend but wanted to know how high it should be hitting at 100 yards?  The rifle is a 7mm rem mag.  I have a few boxes of 175 grain fusion ammo to sight in with.  I main.ly will be hunting bear with it on the west side.  Any help would be appreciated.
Title: Re: sighting in. how high at 100 yards?
Post by: Alan K on March 24, 2011, 06:38:26 PM
Inch and a half or so to be on at 200. . . It may vary a bit but that's a good estimate.
Title: Re: sighting in. how high at 100 yards?
Post by: Dirty Mike on March 24, 2011, 06:40:40 PM
I would look on the federal website and see what your zero is gonna be it might also say on the ammo box but with me I like to be 2 inches high at100
Title: Re: sighting in. how high at 100 yards?
Post by: brew on March 24, 2011, 06:48:41 PM
Inch and a half or so to be on at 200. . . It may vary a bit but that's a good estimate.
agreed....my 7mm mag shot 1.5 inches high at 100 yds will hit dead on at 200.  If your shooting factory loads go to their ammo website and they should have the ballistics for your particular load.  even at 300 yds i think the drop will only be 5 or 6 inches but you should know the ballistics for your load
Title: Re: sighting in. how high at 100 yards?
Post by: D-Rock425 on March 24, 2011, 06:51:35 PM
This is from the back of the box.  Height of bullet trajectory in inches above or below line of sight if zeroed at 100 yards.  Sights 1.5 above bore line.  100 yard zero - 3.6 at 200 and -13.2 at 300. 
Title: Re: sighting in. how high at 100 yards?
Post by: carpsniperg2 on March 24, 2011, 06:59:34 PM
I would go 2" high at 100 and be close to zeroed at 200 yards.
Title: Re: sighting in. how high at 100 yards?
Post by: Dan-o on March 24, 2011, 07:01:59 PM
I sight my 7MM mag in at 2 inches high at 100 yards.   That way, I'm good to 300 yards.   
Title: Re: sighting in. how high at 100 yards?
Post by: brew on March 24, 2011, 07:16:08 PM
"if zeroed at 100 yds".....why would you sight in your rifle for that range unless that is the the only distance you plan to shoot?  at that range if you zeroed in at 100 yds you should still hit the vitals at 200 (3.6 inches low provided you didn't aim for the heart) but if the bear was at 300 yds you would have to aim high 13.2" to hit the vitals.  I don't like aiming above where i need to hit.  when i draw down on fur i like to know that when i pull the trigger i will hit pretty much where i aim---that's why i aim there cuz thats where i want to hit the animal.  You can sight in for bullseye at 100 but would strongly recommend shooting farther distances to see where the bullet hits (then writing down what distance and how far to aim above bullseye and attaching it to the stock of your gun so you can see where to aim).  my advice is to sight dead on at 200 yds and at 300 put it on the point of their shoulder
Title: Re: sighting in. how high at 100 yards?
Post by: timberghost72 on March 24, 2011, 07:24:10 PM
I shoot at a 2" high at 100 yards. I would also sight in with another brand of ammo also (same grain).   I sighted in my 30-06 with some hand loads and then wanted to see how those Federal Fusions would be (I had a box that I purchased about a year before) they ended up being all over the place on paper (4-5 inches). I then checked it with another factory brand and those were closer to the handloads.  :twocents:
Title: Re: sighting in. how high at 100 yards?
Post by: D-Rock425 on March 24, 2011, 07:25:05 PM
"if zeroed at 100 yds".....why would you sight in your rifle for that range unless that is the the only distance you plan to shoot?  at that range if you zeroed in at 100 yds you should still hit the vitals at 200 (3.6 inches low provided you didn't aim for the heart) but if the bear was at 300 yds you would have to aim high 13.2" to hit the vitals.  I don't like aiming above where i need to hit.  when i draw down on fur i like to know that when i pull the trigger i will hit pretty much where i aim---that's why i aim there cuz thats where i want to hit the animal.  You can sight in for bullseye at 100 but would strongly recommend shooting farther distances to see where the bullet hits (then writing down what distance and how far to aim above bullseye and attaching it to the stock of your gun so you can see where to aim).  my advice is to sight dead on at 200 yds and at 300 put it on the point of their shoulder
I'm not going to zero it at 100 that was.just the info on the back of the ammo box.  Sounds like 2 inches high at 100 is the recommendation
Title: Re: sighting in. how high at 100 yards?
Post by: sakoshooter on March 24, 2011, 08:33:32 PM
I sight in 3" high at 100yds, 2.5" high @ 200yds, 4" low @ 300yds. With an average  rifle sighted in for 3" high @ 100yds, you can basically hold dead center chest out to 300 yds without doing any thinking. That's as far as the average guy can shoot accurately anyhow. Any farther than that and you'll need a rock solid rest, a still animal and a couple minutes to get the trajectory sheet out of your pack after ranging it.
This is based on my 30-06 w/165gr Scirroco @ 2850fps. This should be very similar to a 7mag w/175gr bullet.
I aim at the heart unless their way out there. Shootin sticks, a good squeeze and get your tag out.
Title: Re: sighting in. how high at 100 yards?
Post by: norsepeak on March 24, 2011, 08:54:30 PM
I'd recommend actually zeroing your rifle at 200 if that's where you want to be zeroed instead of the zero X inches high at 100 method.  That way you know for sure and you will most likely be able to hold dead on out to around 300 and still have a humane kill. (would hit a little high at 100, and a little low at ~300)  Then, once you are zeroed, go out and do a lot of shooting at distances out to 5or 600 to verify you drop chart.  Then make an accurate drop chart, laminate it and tape it to your stock, so you don't have to dig around in your pack for it, you can set up your scope to dial your distances.  Just my  :twocents:
Title: Re: sighting in. how high at 100 yards?
Post by: Bob33 on March 24, 2011, 09:06:26 PM
There is a concept called "Maximum Point Blank Range".  That is the distance up to which no sight adjustment is necessary: "aim and shoot".  For big game like deer, it is generally a 6" diameter circle.  That means your bullet never goes more than 3" above or below your point of aim.  The idea is that with proper sight in height, you aim where you want the bullet to go, and out to a certain distance it should be +/- 3 inches of that.

It is because of the MPBR concept that shooters generally sight in their rifles to hit high at 100 yards.

A bullet starts below the line of aim because the sight is above the barrel.   For a telescopic sight that is approximately 1.5" above the barrel: if you stick your barrel in the deer's chest, look through the scope, and pull the trigger the bullet will hit about 1.5" below your crosshairs.

With a gun sighted in to hit 3" high at 100 yards, the bullet first crosses the line of sight at around 25 to 30 yards.  It continues rising until it is 3" high at 100 yards.  Most modern caliber bullets continue rising, and will reach their maximum height relative to the line of sight at between 150 and 200 yards. This is where you need to be careful, because if you make your 100 yard sight-in too high, the bullet can get so high at 175 to 200 yards that you can hit an animal very high if you're not careful.  I've spined several animals at these intermediate ranges because I rarely remember to hold low.

After reaching its high point, the bullet will start dropping relative to line of sight.   It will again cross the line of sight at around 250 yards.  At 275 to 300 yards, it will be 3” below the line of sight.  From that distance on, you will need to adjust your aim point.

If you “zero”  your rifle at 100 yards, it will be 3” low by about 200 yards, and you’ll need to adjust your sights from that distance on.
Title: Re: sighting in. how high at 100 yards?
Post by: JackOfAllTrades on March 24, 2011, 09:07:45 PM
Sakoshooter has it right.  An animal has a kill zone, kidneys, lungs, heart are all within the top to bottom zone that Sako points out. So sight in at 100, to give you a hit in the kill zone at the extreme of your shooting ability.

-Steve
Title: Re: sighting in. how high at 100 yards?
Post by: bobcat on March 24, 2011, 09:19:53 PM
I like to go 2 inches high at 100 yards. That's with 243, 270, and 30-06, which I have, or any other similar cartridge. I used to do 3 inches high but I don't like how high it is around 200 yards.
Title: Re: sighting in. how high at 100 yards?
Post by: JackOfAllTrades on March 24, 2011, 09:20:30 PM
Bob... I'll disagree with you.  The bullet does not rise. (in relationship to the barrel)  :chuckle:  Not at all.

-Steve
Title: Re: sighting in. how high at 100 yards?
Post by: bobcat on March 24, 2011, 09:22:07 PM
It rises in relation to the line of sight. I guess you probably know that.
Title: Re: sighting in. how high at 100 yards?
Post by: Bob33 on March 25, 2011, 06:45:34 PM
Bob... I'll disagree with you.  The bullet does not rise. (in relationship to the barrel)  :chuckle:  Not at all.

-Steve
I'm not sure what you're getting at Steve.  The bullet starts below the line of sight and ends up 2" or 3" high at 100 yards, depending on the how the gun is sighted in.
Title: Re: sighting in. how high at 100 yards?
Post by: Bofire on March 25, 2011, 06:53:35 PM
 :)the bullet is falling from the instant it leaves the muzzle. the only reason it "arcs" is cause your barrel is pointed "up", to cross the line of sight.
duh
Carl
Title: Re: sighting in. how high at 100 yards?
Post by: sakoshooter on March 26, 2011, 08:14:26 PM
Bob explained my sighting in method very well.
By sighting in dead on at 200 yds, you will be 7 1/2" low at 300. This is based on the info I already posted. That's definitely enough to miss most animals chest areas if you held dead center.
With the 3" high at 100 yd sight in method, the average high powered rifle shooting an average velocity will be within a 6" vital zone out to 300 yds without thinking about it. Any farther than that and you've really got to know yourself, your gun, the wind etc and the trajectory. Lots of variables that play a big part on an ethical shot past 300 yds. With the Maximum Point Blank Range method or 3" high at a hundred, one big variable has been removed from most shots.
As Bob stated, you can easily 'spine shot' your buck at 100yds +/- but that's why I aim for the heart when they're close - 0 - 150yds. You usually end up hitting the top of the heart and lungs.
Sighting in dead on at 100 or 200 yds is fine in the timber but spot one good buck across that draw on the next ridge and you'll be kicking yourself.
Title: Re: sighting in. how high at 100 yards?
Post by: bobcat on March 26, 2011, 09:25:28 PM
Sighting in dead on at 100 or 200 yds is fine in the timber but spot one good buck across that draw on the next ridge and you'll be kicking yourself.

Not really, you just need to know your rifles trajectory, and hold a little high to compensate for the longer shots. I'd rather have to hold high at 300 yards than hold low at 200 yards. Generally with the longer shots you will have more time to think about it. If I sight my 270 in 3 inches high at 100, it's over 4 inches high at 200. The 3 inches high at 100 yards rule of thumb became popular before laser rangefinders were available, and it kind of made more sense then. Now, with a rangefinder, on the longer shots you don't have to guess at the distance so it's fairly easy to compensate.
Title: Re: sighting in. how high at 100 yards?
Post by: JackOfAllTrades on March 26, 2011, 09:32:19 PM
:)the bullet is falling from the instant it leaves the muzzle. the only reason it "arcs" is cause your barrel is pointed "up", to cross the line of sight.
duh
Carl

 :yeah:

I made a comment earlier just to note to the new people so there is not confusion.  That's all.

-Steve
Title: Re: sighting in. how high at 100 yards?
Post by: JimmyHoffa on March 26, 2011, 09:37:26 PM
And the higher above your barrel that your sights/scope is, the greater the angle for that rise.  Can make for an interesting trajectory.
Title: Re: sighting in. how high at 100 yards?
Post by: bobcat on March 26, 2011, 09:56:03 PM
:)the bullet is falling from the instant it leaves the muzzle. the only reason it "arcs" is cause your barrel is pointed "up", to cross the line of sight.
duh
Carl

 :yeah:

I made a comment earlier just to note to the new people so there is not confusion.  That's all.

-Steve


Do people actually believe that a bullet rises when it leaves the barrel?  That would defy the laws of gravity!   :o
Title: Re: sighting in. how high at 100 yards?
Post by: Bob33 on March 26, 2011, 10:12:32 PM
Where's the "thread jacked" smiley?

The OP asked about sighting in a rifle, not a discourse on external ballistics.

If one wants to get pedantic about it, a bullet can indeed rise.  Point your barrel straight up, pull the trigger, and try to convince that it is dropping.

Gravity works on the bullet the second it leaves the barrel, but its absolute rise or fall, relative to the earth, is a factor primarily of the angle of departure. 

Let's hope that the OP understands we are talking about the bullet's path relative to the sight plane.
Title: Re: sighting in. how high at 100 yards?
Post by: JackOfAllTrades on March 26, 2011, 10:52:18 PM
 :jacked:  Reading here, I think the OP has enough information on how to sight in his rifle. A discussion will often start with one subject and evolve into something else once the original subject fizzles.

Do people actually believe that a bullet rises when it leaves the barrel?  That would defy the laws of gravity!   :o

I spent years on the Firing Line and The High Road discussion forums.  Yes, some people do feel the bullet rises out of the muzzle.

Christ! Forget I made the comment.

-Steve
Title: Re: sighting in. how high at 100 yards?
Post by: bobcat on March 26, 2011, 11:09:31 PM
Christ! Forget I made the comment.

 :chuckle:
Title: Re: sighting in. how high at 100 yards?
Post by: Gutpile on March 27, 2011, 07:14:28 AM
:)the bullet is falling from the instant it leaves the muzzle. the only reason it "arcs" is cause your barrel is pointed "up", to cross the line of sight.
duh
Carl

 :yeah:

I made a comment earlier just to note to the new people so there is not confusion.  That's all.

-Steve


Do people actually believe that a bullet rises when it leaves the barrel?  That would defy the laws of gravity!   :o


Yes, they do. I hear it all the time.
Title: Re: sighting in. how high at 100 yards?
Post by: high country on March 27, 2011, 07:33:43 AM
Wow, can sure tell we are ready to do some shooting!
I can't believe the fact that there are 2 ways to attack this, correction or compensation. You guys are all compensating, try telling him how to correct now....lol.

Title: Re: sighting in. how high at 100 yards?
Post by: BallisticsNut on March 27, 2011, 09:02:52 AM
In theory, the harmonics of a barrel could cause the bullet to rise, ever so slightly from the point of the barrel position.  So, to say that a bullet never rises once it leaves the barrel it not entirely correct.  You could determine that the "barrel whip" could actually cause the bullet to rise above the plane of the barrel once shot if the cartridge is not tuned for that particular rifle.  This is why we tune each cartridge for each particular rifle.  I have seen many references to this topic, such as "barrel whip" the "sine wave affect" and barrel "harmonics".  Essentially, each talking about the same thing.  Personally, I have seen the affects of this barrel whip in action.  I would see as much as 4-6" variance in shot placements, shooting from a stationary barrel position at a distance of 200 yards.  Testing the harmonics of a particular rifle and adjusting or reducing  the "barrel whip" so that the bullet leaves the barrel at the optimum time to produce the most accurate shots.  Thus, the term ladder testing.
 :twocents:
Title: Re: sighting in. how high at 100 yards?
Post by: D-Rock425 on March 27, 2011, 09:12:26 AM
This is all interesting stuff but I guess I will sight in at 2" high at 100 for now until I get a chance to shoot 200 and then zero it at 200.
Title: Re: sighting in. how high at 100 yards?
Post by: Alan K on March 27, 2011, 09:57:22 AM
If you get a ballistics calculator and enter in all your information correctly, it will tell you exactly how high you need to at 100 to be dead nuts at 200.  If you ultimately plan to be dead on at 200 it will save you some ammo in my opinion to do it right from 100 rather than essentially sighting in twice, once at 100 and once at 200. Of course you'll want to check it at 200, but at least you wont be shooting multiple groups.

For example, for my hand load for my .300 WSM I'm just 1.36 inches high to dead on at 200, with a sight height of 1.5 inches.  

The calculators are only as good as the data you put into it however, so if you go this route you'll need your elevation, true bullet speed, your BC, your bullet weight, your temperature, and your sight height.  Your pressure is generally calculated based on your temperature and elevation I believe.
Title: Re: sighting in. how high at 100 yards?
Post by: high country on March 27, 2011, 12:42:57 PM
You will  find sight height makes a good bit of difference....especially at range. B.c. will only be close too and may need adjustment from published info.
Title: Re: sighting in. how high at 100 yards?
Post by: JackOfAllTrades on March 27, 2011, 01:59:25 PM
Wow, can sure tell we are ready to do some shooting!
I can't believe the fact that there are 2 ways to attack this, correction or compensation. You guys are all compensating, try telling him how to correct now....lol.

I shot this morning!  :chuckle:

As for instructing how to 'correct', if a guy doesn't know where he should sight in at 100yds, I'm doubting he's got target turrets on his scope. I'm also doubting that a 300yd shot is within his capability. (realistic expectation of a kill shot) It's not time yet to teach how to correct when a given range to target is known. Instruction has already been given to keep him in a kill zone out through MPBR.

-Steve
Title: Re: sighting in. how high at 100 yards?
Post by: sakoshooter on March 28, 2011, 04:15:55 AM
Sighting in dead on at 100 or 200 yds is fine in the timber but spot one good buck across that draw on the next ridge and you'll be kicking yourself.

Not really, you just need to know your rifles trajectory, and hold a little high to compensate for the longer shots. I'd rather have to hold high at 300 yards than hold low at 200 yards. Generally with the longer shots you will have more time to think about it. If I sight my 270 in 3 inches high at 100, it's over 4 inches high at 200. The 3 inches high at 100 yards rule of thumb became popular before laser rangefinders were available, and it kind of made more sense then. Now, with a rangefinder, on the longer shots you don't have to guess at the distance so it's fairly easy to compensate.

According to the trajectory chart on Berger's website, your 270 with a 130gr bullet, using a G1 BC of .450 @ 3000fps sighted in +3" at 100 is also +3" at 200 and -2.25" at 300yds.
Title: Re: sighting in. how high at 100 yards?
Post by: bobcat on March 28, 2011, 07:34:56 PM
Sighting in dead on at 100 or 200 yds is fine in the timber but spot one good buck across that draw on the next ridge and you'll be kicking yourself.

Not really, you just need to know your rifles trajectory, and hold a little high to compensate for the longer shots. I'd rather have to hold high at 300 yards than hold low at 200 yards. Generally with the longer shots you will have more time to think about it. If I sight my 270 in 3 inches high at 100, it's over 4 inches high at 200. The 3 inches high at 100 yards rule of thumb became popular before laser rangefinders were available, and it kind of made more sense then. Now, with a rangefinder, on the longer shots you don't have to guess at the distance so it's fairly easy to compensate.

According to the trajectory chart on Berger's website, your 270 with a 130gr bullet, using a G1 BC of .450 @ 3000fps sighted in +3" at 100 is also +3" at 200 and -2.25" at 300yds.

Yeah, that's higher than I want it. So somewhere between 100 and 200 yards it's more than 3 inches above line of sight. I'd rather have it hitting a little lower at 200 than it is at 100. That's just my preference. I used to always go by the 3 inches high at 100 yards rule, but I changed over the years. I can sight it in 2 inches high at 100 and still hold dead on at 300. Out at 350 and beyond it's still going to require the use of a rangefinder, or at least a good estimate of the distance, and holding over the appropriate amount. I'd rather have my bullets hitting fairly close to my point of aim at the closer distances when I don't have a lot of time to think about it.
Title: Re: sighting in. how high at 100 yards?
Post by: Smokepole on March 28, 2011, 07:45:03 PM
The way I was shooting last year, I may as well sight mine in 36" high at 100.  Maybe I could hit the moon.   :chuckle:

Ballistics is a big subject with lots of debate.  Wait till people start talking bout shooting up and down steep slopes and you'll see the sparks fly.  But I'm staying out of this one.  For what it's worth, everyone I know sight their 7MM in 2" high at 100.
Title: Re: sighting in. how high at 100 yards?
Post by: JimmyHoffa on March 28, 2011, 07:53:25 PM
I was wondering how long until someone brought up the slant range effect....or sighting at sea level and shooting above 5000 ft....or....
Title: Re: sighting in. how high at 100 yards?
Post by: Bofire on March 29, 2011, 05:03:39 PM
 :)1. the statement "drops from the second it leaves the muzzle" is based on a 'horizontal' barrel.
2. If you have barrel "whip" your barrel is not 'horizontal'.(harmonics also)
3. (for nitpickers) How do you have something 'horizontal' to a orb? or orbital effect? :dunno:
 however for the virtually zero measureable impact I think we are all safe.  :chuckle:
I vote for MOC, minute of coyote.
ok key board egg heads fire away!! :chuckle:
Carl
Title: Re: sighting in. how high at 100 yards?
Post by: sakoshooter on March 29, 2011, 10:55:19 PM
I don't get too crazy with math on steep angled shots but I am aware of the affects of it. Being concious of it makes me aim down tight on the heart on either a steep up or down shot. I skip all the inclination formulas and simply use the 1/2 gravity rule. Since gravity has it's greatest affect on a bullet fired basically horizontal, a shot taken 45 degrees up or down would only be affected by half of the normal gravitational pull. Since a 45 degee angle is damn steep, most of us don't usually encounter it(we like to say we did), it usually doesn't come into play enough to make a huge difference. I would venture to say that there is more human error involved in shots taken hunting than gravitational errors.
Half gravity: If you actually use a range finder and it comes up at say; 200yds and it's a steep 45 degree slope(up or down is the same), aim as if it's 100yds. Plus or minus a couple big buck chest hairs, you'll be right in there.
Title: Re: sighting in. how high at 100 yards?
Post by: Smokepole on March 30, 2011, 08:25:46 AM
I don't get too crazy with math on steep angled shots but I am aware of the affects of it. Being concious of it makes me aim down tight on the heart on either a steep up or down shot. I skip all the inclination formulas and simply use the 1/2 gravity rule. Since gravity has it's greatest affect on a bullet fired basically horizontal, a shot taken 45 degrees up or down would only be affected by half of the normal gravitational pull. Since a 45 degee angle is damn steep, most of us don't usually encounter it(we like to say we did), it usually doesn't come into play enough to make a huge difference. I would venture to say that there is more human error involved in shots taken hunting than gravitational errors.
Half gravity: If you actually use a range finder and it comes up at say; 200yds and it's a steep 45 degree slope(up or down is the same), aim as if it's 100yds. Plus or minus a couple big buck chest hairs, you'll be right in there.

Sakoshooter,

Your rocket science is right on the money.  Long as the wind isn't blowin'.
Title: Re: sighting in. how high at 100 yards?
Post by: D-Rock425 on April 05, 2011, 09:42:02 AM
I thought this gun stuff was simple I guess I was wrong.   I will just keep shooting my bow at least I understand that stuff.
Title: Re: sighting in. how high at 100 yards?
Post by: JackOfAllTrades on April 05, 2011, 10:12:13 AM
Absolutely no different than shooting a bow. You have different sight pins for your bow intended for different ranges to targets, right? If you don't, you hold high or low depending on distance to target. If anything, a short range bow shooter exagerates the same trajectory of an arrow when compared to the path of a bullet. Shoot an arrow at a down angle. Shoot a bullet at a down angle. It's all the same relative horizontal distance to target vs velocity of the projectile and total distance of the projectile flight horizontal to the gravitational pull of the earth that determines where you should aim/sight-in to get the impact where you want it.

-Steve
Title: Re: sighting in. how high at 100 yards?
Post by: bucklucky on April 05, 2011, 10:24:38 AM
Holy Crap, whatever happened to  "Keep it simple stupid"  :chuckle:

Practice makes perfect, sight the damn thing in, 2 inches high is fine,  and practice at yardage. Know your gun , know where it shoots at yardage (100, 200, 300, 400, etc) and keep practicing. Your only as good as you can shoot, as long as the gun is accurate.
Title: Re: sighting in. how high at 100 yards?
Post by: Buckmark on April 05, 2011, 10:30:03 AM
I thought this gun stuff was simple I guess I was wrong.   I will just keep shooting my bow at least I understand that stuff.
It is, ask one question and get 50 different answers.
Go shoot your gun, use the 2 inch @100 as a baseline and have fun, use different ammo and find what your gun likes, and then shoot, shoot and shoot some more, have fun, get comfortable and confident with your equipment and kill a bear...
Title: Re: sighting in. how high at 100 yards?
Post by: 6x6in6 on April 05, 2011, 11:10:39 AM
I sight in 3" high at 100yds, 2.5" high @ 200yds, 4" low @ 300yds. With an average  rifle sighted in for 3" high @ 100yds, you can basically hold dead center chest out to 300 yds without doing any thinking. That's as far as the average guy can shoot accurately anyhow. Any farther than that and you'll need a rock solid rest, a still animal and a couple minutes to get the trajectory sheet out of your pack after ranging it.
This is based on my 30-06 w/165gr Scirroco @ 2850fps. This should be very similar to a 7mag w/175gr bullet.
I aim at the heart unless their way out there. Shootin sticks, a good squeeze and get your tag out.

It is very similar with 175's.
At 3 1/2" high it puts me at +3" at 200 and at -2 1/2" at 300 if I remember correctly.  I don't have my data with me here at work but I'm pretty certain that's the numbers.
No need for adjustments out to 325 is in the kill zone.  :)
Title: Re: sighting in. how high at 100 yards?
Post by: JackOfAllTrades on April 05, 2011, 12:40:20 PM
No need for adjustments out to 325 is in the kill zone.  :)

 (I thought this gun stuff was simple I guess I was wrong.   I will just keep shooting my bow at least I understand that stuff.) Yeah.. With a bow anything more than 30yds and a 10 degree down angle you need to adjust.  So I don't see how the rifle stuff is perplexing.

-Steve
Title: Re: sighting in. how high at 100 yards?
Post by: D-Rock425 on April 06, 2011, 08:37:50 PM
No need for adjustments out to 325 is in the kill zone.  :)

 (I thought this gun stuff was simple I guess I was wrong.   I will just keep shooting my bow at least I understand that stuff.) Yeah.. With a bow anything more than 30yds and a 10 degree down angle you need to adjust.  So I don't see how the rifle stuff is perplexing.with my bow a 30 degree angle at 40 yards is s difference of 5 yards I would need to shoot the shot for 35 yards.  When I said my bow stuff was simple I meant its simple because I know my pins get sighted in at 20 30 40 50 and 60 yards.

-Steve
Title: Re: sighting in. how high at 100 yards?
Post by: JackOfAllTrades on April 06, 2011, 10:44:31 PM
Quote
No need for adjustments out to 325 is in the kill zone

Doesn't get any more simple than that. No pins. No five or ten yard adjustments.

-Steve
Title: Re: sighting in. how high at 100 yards?
Post by: BOWHUNTER45 on April 09, 2011, 06:23:32 PM
I dont know how some of these ballistics are coming up but all I can tell ya is when shooting in my .270 with 140 gr hornaday SPBT I zero in at 1 1/2 inches high at 100 ( from the center of the bullseye ) 3 inches is way to high ...one day your going to shoot down hill or up hill and your going over top of your target.. I am dead on out to 300 yrds with this load and it has not ever failed me yet .. I have made alot futher shoots and it is still the same result ( deadly) again its all on the shooter .... PEACE !!!
Title: Re: sighting in. how high at 100 yards?
Post by: ICEMAN on April 09, 2011, 08:16:15 PM
I dont know how some of these ballistics are coming up but all I can tell ya is when shooting in my .270 with 140 gr hornaday SPBT I zero in at 1 1/2 inches high at 100 ( from the center of the bullseye ) 3 inches is way to high ...one day your going to shoot down hill or up hill and your going over top of your target.. I am dead on out to 300 yrds with this load and it has not ever failed me yet .. I have made alot futher shoots and it is still the same result ( deadly) again its all on the shooter .... PEACE !!!

What do you mean you are dead on out to 300 yards?
Title: Re: sighting in. how high at 100 yards?
Post by: D-Rock425 on April 09, 2011, 08:24:47 PM
 :dunno:
Title: Re: sighting in. how high at 100 yards?
Post by: huntinfool86 on April 09, 2011, 08:48:24 PM
i used to shoot a 7mm you want to be 11/2 high at a 100yds dead on at 200yds and the rest you can go to winchester.com or federal.com to get the rest of the ballistics. i recommend printed your ballistics out and laminating it, then taping it to your stock
Title: Re: sighting in. how high at 100 yards?
Post by: sakoshooter on April 10, 2011, 01:13:54 AM
I dont know how some of these ballistics are coming up but all I can tell ya is when shooting in my .270 with 140 gr hornaday SPBT I zero in at 1 1/2 inches high at 100 ( from the center of the bullseye ) 3 inches is way to high ...one day your going to shoot down hill or up hill and your going over top of your target.. I am dead on out to 300 yrds with this load and it has not ever failed me yet .. I have made alot futher shoots and it is still the same result ( deadly) again its all on the shooter .... PEACE !!!

According to the Berger ballistic chart, sighting in +1.5" @ 100 makes you dead on @ 192yds. You're 7.79" low at 300yds. 21.84" low at 400yds and 43.67" low at 500yds. Your MPBR is about 235yds using a 6" vital zone.
I used a G1 BC of .450 and was generous and gave you 2900fps. I also used 60 degrees. If it's close to freezing during hunting season, the velocity will be less and consequently the ballistics will look worse.

Changing that +1.5" @ 100yd sight in to +3" @ 100yds doesn't really change anything significantly up close but increases your MPBR to about 290yds and dead on @ 258yds. 3.23" low @ 300yds, 15.76" low @ 400yds and 36" low @ 500yds.

As you can see, an inch and a half bought you 55yds of not thinking about where to hold your X hairs.
Title: Re: sighting in. how high at 100 yards?
Post by: Bob33 on April 10, 2011, 07:52:51 AM
Changing that +1.5" @ 100yd sight in to +3" @ 100yds doesn't really change anything significantly up close but increases your MPBR to about 290yds and dead on @ 258yds. 3.23" low @ 300yds, 15.76" low @ 400yds and 36" low @ 500yds.

As you can see, an inch and a half bought you 55yds of not thinking about where to hold your X hairs.
I agree with your ballistics.  The only caution I would add: being 3" high at 100 yards with this data means the bullet is still rising relative to the point of aim. The bullet will reach a maximum height ("Mid Range Trajectory") of about 3.5 inches at around 150 yards.  If you happen to shoot 3 or 4 inches higher than your intended point of aim, the bullet will hit 7" high.  That could be enough to miss a smaller animal.  I used to sight in for 3" high, but shot high on too many animals at mid range (150 to 200 yards).  I always remember to hold high at longer distances, but I never remember to hold low at closer distances.  The solution: I dropped my 100 yard impact to 2.5" high.  It shaves a half inch off the MRT which isn't much, but it helps.

My advice to all is to always check the mid range trajectory.  If you can, shoot some paper targets at that distance.  You might be stunned to see how high the bullet impact is.
Title: Re: sighting in. how high at 100 yards?
Post by: sakoshooter on April 10, 2011, 01:28:13 PM
Bob33,
Agreed. Know your bullet's trajectory. That's all I was trying to point out. It would seem by some of what I've read that some folks think a bullet travels flat for a given distance then mysteriously falls.
Title: Re: sighting in. how high at 100 yards?
Post by: ICEMAN on April 10, 2011, 06:14:33 PM
Sako, I agree with your logic. I have sighted my 300RUM for +2.0 at 200yards.... This puts me at -3" at 300 yards.
 
I shoot down the proverbial pipe out to 300yards, my round never outside of my line of sight more than a total of 3 inches high or low...
 
I too have my ballistics taped to the side of my rifle for anytime I may need to look at it for maybe a shot further than 300 (which I have never taken at game...)  I do know I can repetitously hit a pop can at 300yards as long as I have a good rest...
 
In theory; for game under 300 yards, I should be able to shoot center of lung and not worry about trajectory, hitting within 3" of my point of aim... 
 
(sounds good on paper...  :chuckle:  )
Title: Re: sighting in. how high at 100 yards?
Post by: Bob33 on April 10, 2011, 07:44:02 PM
It would seem by some of what I've read that some folks think a bullet travels flat for a given distance then mysteriously falls.
That's only true for "magnums".  All other rounds fall right out the end of the barrel and go straight down. :chuckle:
Title: Re: sighting in. how high at 100 yards?
Post by: sakoshooter on April 10, 2011, 11:01:18 PM
It would seem by some of what I've read that some folks think a bullet travels flat for a given distance then mysteriously falls.
That's only true for "magnums".  All other rounds fall right out the end of the barrel and go straight down. :chuckle:

You're too funny Bob.
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