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Old February 16th, 2012, 07:37 PM #1
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25 Yard zero for 300 meters?

I tried looking through Google and found no results.
I want to zero my AR to 300 meters.
However, the range closest to me only offers 25 yards.
I'm far too lazy to drive further just to zero.
So I'm a couple meters shy to zero at 25M.

I was wondering if anyone could help me figure out how big a target should be at 25 yards to zero at 300 meters. Anything close to a 300M zero would be great.

Thanks!
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Old February 16th, 2012, 07:43 PM #2
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Here is a link to a 25 Meter target and instructions for 300 meter zero. Even at 25 yards it should get you close to a 300 yard zero.

http://www.eotech-inc.com/documents/...ire_Target.pdf
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Old February 16th, 2012, 07:45 PM #3
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The correct answer is to go to a longer range so you can figure the ballistics for your rifle and ammo.

If you want a guesstimate, Winchester has a ballistics calculator that can get you in the ballpark.
http://ballisticscalculator.winchester.com/
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Old February 16th, 2012, 08:02 PM #4
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I appreciate the help you guys.
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Old February 16th, 2012, 08:30 PM #5
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When i was stationed at Andrews AFB the only range there was 25m. We zeroed our rifles on a silhoutte that represented a human torso at 300m. When we went down to AP hill we shot pop up targets out to 300m with no further sight in needed. Im sure we wernt hitting poa on the pop ups but it was close enough everbody still qualified and most shot expert.
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Old February 17th, 2012, 02:14 PM #6
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In the rough rule of thumb, sight in at your 25yd. To split hairs , possably just barely low..

Disclaimer A: not a big believer in close range sighting for long range, sight in ( to a particular impact point) at 100 or more , then work backward to verify at close.

Disclaimer B : if you are going to do the close range sighting in , 50yds is more useful trajectory.
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Old February 28th, 2012, 10:57 AM #7
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A lot of this also depends on the caliber and load. Shooting is really just a few complex math formulae put together. I highly recommend reading into the details of ballistics(specifically trajectory) while "zeroing" your scope. You will find that every shot at every distance and in every environment is different.
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Old February 28th, 2012, 11:22 AM #8
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When using the ballistics calculator, keep in mind that ar's height over bore isnt 1.5 inches. It's usually closer to 2.5-2.75 depending on ure setup. This makes the 50 yd zero much more useful. You dont have the bullet over top of your sight line as high for as long.

With 193:
50 yds-0
100 yds- +1.7
150yds- +2.3
200 yds- +1.7
250 yds- -.2
300 yds- -3.7

Sure beats it being +11" at 200
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Old February 28th, 2012, 02:21 PM #9
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JBM online ballistic calculator: http://www.jbmballistics.com/ballist...culators.shtml

It's free, and you can choose G7 BC's...
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Old February 28th, 2012, 02:24 PM #10
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Federal also offers a free ballistics calculator


   
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