collapse
For when you only get one shot! FREE SHIPPING ON ORDERS OVER $99.00!

Author Topic: sighting in. how high at 100 yards?  (Read 42851 times)

Offline D-Rock425

  • Washington For Wildlife
  • Trade Count: (+3)
  • Explorer
  • *
  • Join Date: Jun 2009
  • Posts: 11876
  • Location: Lake stevens
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.

Online Alan K

  • Off-Topics
  • Trade Count: (+2)
  • Sourdough
  • *
  • Join Date: Sep 2008
  • Posts: 2448
  • Location: Lewis County, WA
  • University of Idaho Alumni
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

  • Trade Count: (0)
  • Longhunter
  • *****
  • Join Date: Apr 2009
  • Posts: 768
  • Location: tenino, wa
  • Co-founder Of Team Dogleg
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

  • Virtual Campfire
  • Trade Count: (+5)
  • Longhunter
  • *
  • Join Date: May 2010
  • Posts: 849
  • Location: yelm
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
beer---it's whats for dinner

Offline D-Rock425

  • Washington For Wildlife
  • Trade Count: (+3)
  • Explorer
  • *
  • Join Date: Jun 2009
  • Posts: 11876
  • Location: Lake stevens
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

  • Site Sponsor
  • Global Moderator
  • Trade Count: (+77)
  • Legend
  • *****
  • Join Date: Sep 2009
  • Posts: 25652
  • Location: Goldendale,WA
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.
Owner: SPLIT DIAMOND TACTICAL
Firearms/Transfers/Parts/Optics
2011 HW Head Competition Winner

Offline Dan-o

  • Site Sponsor
  • Trade Count: (+5)
  • Old Salt
  • *****
  • Join Date: Jul 2010
  • Posts: 8444
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.   
Member:   Yakstrakgutp (or whatever we are)
I love the BFRO!!!
I wonder how many people will touch their nose to their screen trying to read this...

Offline brew

  • Virtual Campfire
  • Trade Count: (+5)
  • Longhunter
  • *
  • Join Date: May 2010
  • Posts: 849
  • Location: yelm
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
beer---it's whats for dinner

Offline timberghost72

  • Virtual Campfire
  • Trade Count: (0)
  • Sourdough
  • *
  • Join Date: Mar 2009
  • Posts: 2046
  • Location: Heading up the MLH
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

  • Washington For Wildlife
  • Trade Count: (+3)
  • Explorer
  • *
  • Join Date: Jun 2009
  • Posts: 11876
  • Location: Lake stevens
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

  • WFW Board of Directors
  • Trade Count: (+1)
  • Frontiersman
  • *
  • Join Date: Nov 2009
  • Posts: 3584
  • Location: Puyallup
  • Groups: Life Memberr NRA, Life Member Sumner Sportsmans Association
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.
I aim at the heart unless their way out there. Shootin sticks, a good squeeze and get your tag out.
Rhinelander, WI
Home of the Hodag

Offline norsepeak

  • Washington For Wildlife
  • Trade Count: (0)
  • Sourdough
  • *
  • Join Date: Sep 2008
  • Posts: 1891
  • Location: Chinook Pass, Wa
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

  • Global Moderator
  • Trade Count: (+2)
  • Explorer
  • *****
  • Join Date: Apr 2009
  • Posts: 16775
  • Groups: SCI, RMEF, NRA
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.
Nature. It's cheaper than therapy.

Offline JackOfAllTrades

  • Rasbo said I Ain't Right.
  • Trade Count: (0)
  • Old Salt
  • ******
  • Join Date: Feb 2009
  • Posts: 6508
  • Location: Lynden, WA.
  • Μολὼν λαβέ
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.

-Steve
The NRA says I'm a Master!
Colt's, Ruger's, Dan Wesson, & Kimber are my friends!
Proud to be a U.S. Navy Veteran.

If you never follow your dreams, you'll never go anywhere.

Critical thinking keeps people from freaking the hell out every time some half baked blogger forgets his meds. Unlike some of you, I do not have TawkethOutOfAnus© syndrome.

Offline bobcat

  • Global Moderator
  • Trade Count: (+6)
  • Legend
  • *****
  • Join Date: Mar 2007
  • Posts: 34174
  • Location: Rochester
    • robert68
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.

Offline JackOfAllTrades

  • Rasbo said I Ain't Right.
  • Trade Count: (0)
  • Old Salt
  • ******
  • Join Date: Feb 2009
  • Posts: 6508
  • Location: Lynden, WA.
  • Μολὼν λαβέ
Re: sighting in. how high at 100 yards?
« Reply #15 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
The NRA says I'm a Master!
Colt's, Ruger's, Dan Wesson, & Kimber are my friends!
Proud to be a U.S. Navy Veteran.

If you never follow your dreams, you'll never go anywhere.

Critical thinking keeps people from freaking the hell out every time some half baked blogger forgets his meds. Unlike some of you, I do not have TawkethOutOfAnus© syndrome.

Offline bobcat

  • Global Moderator
  • Trade Count: (+6)
  • Legend
  • *****
  • Join Date: Mar 2007
  • Posts: 34174
  • Location: Rochester
    • robert68
Re: sighting in. how high at 100 yards?
« Reply #16 on: March 24, 2011, 09:22:07 PM »
It rises in relation to the line of sight. I guess you probably know that.

Offline Bob33

  • Global Moderator
  • Trade Count: (+2)
  • Explorer
  • *****
  • Join Date: Apr 2009
  • Posts: 16775
  • Groups: SCI, RMEF, NRA
Re: sighting in. how high at 100 yards?
« Reply #17 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.
Nature. It's cheaper than therapy.

Offline Bofire

  • Off-Topics
  • Trade Count: (+3)
  • Old Salt
  • *
  • Join Date: Oct 2007
  • Posts: 5221
  • Location: Yelm
  • Harley YAR YAR YAR!
Re: sighting in. how high at 100 yards?
« Reply #18 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
When the chips are down..... the buffalo is empty!!

I do not shop at Amazon

Offline sakoshooter

  • WFW Board of Directors
  • Trade Count: (+1)
  • Frontiersman
  • *
  • Join Date: Nov 2009
  • Posts: 3584
  • Location: Puyallup
  • Groups: Life Memberr NRA, Life Member Sumner Sportsmans Association
Re: sighting in. how high at 100 yards?
« Reply #19 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.
« Last Edit: March 28, 2011, 04:07:27 AM by sakoshooter »
Rhinelander, WI
Home of the Hodag

Offline bobcat

  • Global Moderator
  • Trade Count: (+6)
  • Legend
  • *****
  • Join Date: Mar 2007
  • Posts: 34174
  • Location: Rochester
    • robert68
Re: sighting in. how high at 100 yards?
« Reply #20 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.

Offline JackOfAllTrades

  • Rasbo said I Ain't Right.
  • Trade Count: (0)
  • Old Salt
  • ******
  • Join Date: Feb 2009
  • Posts: 6508
  • Location: Lynden, WA.
  • Μολὼν λαβέ
Re: sighting in. how high at 100 yards?
« Reply #21 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
The NRA says I'm a Master!
Colt's, Ruger's, Dan Wesson, & Kimber are my friends!
Proud to be a U.S. Navy Veteran.

If you never follow your dreams, you'll never go anywhere.

Critical thinking keeps people from freaking the hell out every time some half baked blogger forgets his meds. Unlike some of you, I do not have TawkethOutOfAnus© syndrome.

Offline JimmyHoffa

  • Virtual Campfire
  • Trade Count: (+2)
  • Old Salt
  • *
  • Join Date: Sep 2010
  • Posts: 9834
  • Location: 150 Years Too Late
Re: sighting in. how high at 100 yards?
« Reply #22 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.

Offline bobcat

  • Global Moderator
  • Trade Count: (+6)
  • Legend
  • *****
  • Join Date: Mar 2007
  • Posts: 34174
  • Location: Rochester
    • robert68
Re: sighting in. how high at 100 yards?
« Reply #23 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

Offline Bob33

  • Global Moderator
  • Trade Count: (+2)
  • Explorer
  • *****
  • Join Date: Apr 2009
  • Posts: 16775
  • Groups: SCI, RMEF, NRA
Re: sighting in. how high at 100 yards?
« Reply #24 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.
Nature. It's cheaper than therapy.

 

* Recent Topics

Cougar down by bearpaw
[Today at 06:04:52 AM]


Western Wyoming Mule Deer in Crisis by bearpaw
[Today at 05:59:56 AM]


Heads up, Incoming BAD legislation, rattle the cages POLITELY in Olympia by poopooheaddad
[Today at 05:57:22 AM]


ElkNut Team- We Had Another Awesome Year! by boneaddict
[Today at 05:55:11 AM]


Stolen camera!!! by JakeLand
[Today at 05:54:33 AM]


F/S NEW Benelli Super Sport 12 gauge 30" "REDUCED" by zwickeyman
[Today at 05:38:55 AM]


REI Co-Op Siesta 30 Sleeping Bag FS by adamR
[Today at 04:59:06 AM]


Klymit Static V2 Inflatable Sleeping Pad FS by adamR
[Today at 04:57:57 AM]


Cougar Research from Alberta by bearpaw
[Today at 04:46:43 AM]


Brand new Rei flex chair by Kyle1112
[Today at 04:31:42 AM]


Neah Bay Rock fish newbie by BigGoonTuna
[Today at 04:20:46 AM]


Bloodsport Arrows by tgomez
[Today at 02:14:43 AM]


Blacktail food plot by fishnfur
[Today at 12:26:33 AM]


Trapping Marten by JakeLand
[Today at 12:07:02 AM]


Idaho Archery Elk in Pioneer Zone by spin05
[Yesterday at 11:53:24 PM]


Dealing with backyard poop by h2ofowlr
[Yesterday at 11:02:07 PM]


Elk deer by Kylew
[Yesterday at 11:01:01 PM]


Otter by fatslinger
[Yesterday at 10:38:52 PM]


Prime rib prep question?? by DaveMonti
[Yesterday at 10:28:50 PM]


It has Started by JWEBB
[Yesterday at 10:27:33 PM]