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Author Topic: sighting in. how high at 100 yards?  (Read 47902 times)

Offline D-Rock425

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sighting in. how high at 100 yards?
« 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.

Offline Alan K

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Re: sighting in. how high at 100 yards?
« Reply #1 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.

Offline Dirty Mike

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Re: sighting in. how high at 100 yards?
« Reply #2 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

Offline brew

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Re: sighting in. how high at 100 yards?
« Reply #3 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
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Offline D-Rock425

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Re: sighting in. how high at 100 yards?
« Reply #4 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. 

Offline carpsniperg2

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Re: sighting in. how high at 100 yards?
« Reply #5 on: March 24, 2011, 06:59:34 PM »
I would go 2" high at 100 and be close to zeroed at 200 yards.
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Offline Dan-o

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Re: sighting in. how high at 100 yards?
« Reply #6 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.   
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Offline brew

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Re: sighting in. how high at 100 yards?
« Reply #7 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
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Offline timberghost72

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Re: sighting in. how high at 100 yards?
« Reply #8 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:

Offline D-Rock425

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Re: sighting in. how high at 100 yards?
« Reply #9 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

Offline sakoshooter

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Re: sighting in. how high at 100 yards?
« Reply #10 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.
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Offline norsepeak

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Re: sighting in. how high at 100 yards?
« Reply #11 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:

Offline Bob33

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Re: sighting in. how high at 100 yards?
« Reply #12 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.
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Re: sighting in. how high at 100 yards?
« Reply #13 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.

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Re: sighting in. how high at 100 yards?
« Reply #14 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.

 

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