Sight in distance for Eotech

100 yards, generally - then you can use the standard ballistics data from the ammo manufacturer if you intend to reach out further to 200-300 yards. The math is simple that way.
 
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From the Shooting Wire March 11, 2009

Skill Set: Zeroing The AR
Editor's Note: Today's feature comes to The Shooting Wire from our companion shooting news service, The Tactical Wire. Due to the extremely high positive responses we received on this short, but very informative feature on "Zeroing the AR" rifle, we wanted to share it with Shooting Wire readers as well. We thank Training Editor Tiger McKee and Editor Rich Grassi for this very informative piece of information.

By Tiger McKee


There is a constant ongoing debate on at what distance the AR rifle should be zeroed. Ideally you need a zero that provides the least deviation between your POA (point of aim) and the actual POI (point of impact) of your bullet. From tests I have run it seems that the best distance to zero the AR for self-defense and law-enforcement purposes is 75 yards.

A 75 yard zero provides the least deviation between your POA and POI from 25 to 100 yards. At 25 yards the POI will be around 1.5 inches low, and at 100 yards POI is approximately 1.5 inches high. Of course this depends on the offset between your sights and barrel, barrel twist and length, and ammo. So for this discussion we're talking about using iron sights, or a red-dot optic mounted on a flattop rifle.

There are some people using 25 yard zeroes, based on the fact that 25 yards and closer is where the majority of their shooting will take place, but this creates a couple of problems. First, even with a 25 yard zero, once you get 20 yards and closer you'll still have to compensate for the offset between the sights and barrel because the POI will be 2-2.5 inches lower than your POA. With body shots this may not be an issue, but for headshots, especially in a hostage situation, it is critical. The second problem with a 25 yard zero is that if you do need to take a shot from extended distances your POI will be way off. For example a shot from 100 yards with a 25 yard zero will have a POI around 6-9 inches high, again depending on weapon variables. Having to compensate for this much difference between POA and POI can be difficult, especially under stress.

What about if you are forced to make a shot from extended distances, say a shot from 200 yards? First, it will be rare that you would have to make a shot at that distance, especially in LE or self-defense work. Plus, the average drop of the .223 from 100 to 200 yards is roughly 3 inches, so with a 75 yd zero you're still capable of hitting body shots by aiming center of mass.

The beauty of the rifle is the ability to place a single projectile exactly where you want it. So regardless of what distance you zero at, learn the difference between POA and POI from 3 to 100 yards. Hit the range, work from actual fighting positions and different distances so you have the data necessary and develop the skills required to get that hit. When lives are at stake, you may not get a second chance.

Tiger McKee is director of Shootrite Firearms Academy, located in northern Alabama, author of The Book of Two Guns, a staff member of several firearms/tactical publications, and an adjunct instructor for the F.B.I. (256) 582-4777 www.shootrite.org
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Depends on sight height, caliber, and size of target.
A 50m zero 5.56 M855, sights 2" high will give you about 7 inches of drop at 300 yrd. An inch high at 120yrd.
A 260yrd (same as 35yrd) zero gives you 3" high at 150yrd, 3" low at 300yard, easy to remember.
It depends on what your needs are.

http://www.ballisticsimulator.com/
 
In simulation, 1moa dot, Wind 4mph->, stationary target:
eotech.JPG

3" high at 150 is twice the angle of 3" high at 300

5.56 Radway Green ( RG 97 ) ss109
Altitude : 0 ft Temperature : 59 °F
Bullet Weight : 62 gr BC : 0.304
Xwind Speed : 4 mph Xwind Angle : 90 °
Muzzle Velocity : 3122 fps Zero Range : 260 yards
Target Speed : 4 mph Angle : 0.0 degrees

MilRange is the number of inches covered by one Mildot. Scope Magnification: x1
Range MilRange Height Hclicks Wind Wclicks Vel Energy TOF Lead LClicks
------- ------- ------- ------- ------- ------- ------- ------- ------- ------- -------
0 0.0 -2.00 0 0.0 0 3122.0 3787.1 0.000 0.0 0
50 0.2 0.75 6 0.1 1 2960.3 3404.9 0.049 1.6 12
100 0.4 2.50 10 0.4 1 2804.5 3056.0 0.101 3.3 13
150 0.5 3.14 8 0.9 2 2654.1 2737.0 0.156 5.1 13
200 0.7 2.55 5 1.6 3 2508.6 2445.1 0.215 7.0 13
250 0.9 0.58 1 2.5 4 2367.7 2178.1 0.276 9.0 14
300 1.1 -2.95 -4 3.7 5 2231.2 1934.2 0.341 11.2 14
350 1.3 -8.23 -9 5.2 6 2099.1 1712.1 0.411 13.4 15
 
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remember factory max range for the eotech is 300. However try one of the magnifiers, either aimpoint or eotech as this is a nice addition.
 
Def90 said:
remember factory max range for the eotech is 300. However try one of the magnifiers, either aimpoint or eotech as this is a nice addition.
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Really? I shot a coyote on the move at 450 yards(measured) with my Eotech "naked" I guess the "max distance" isn't such a concrete piece of information.

Your zero range depends on your purpose. Either the 50 or 75 yard zero will work well for close to intermediate distance shooting.

TDC
 
actually without a fair bit of practice you'd be aiming off or having spent a lot of time zeroing for that distance. Having used an eotech for the alst 4 years i love the sight for what it was designed, a CQB sight, you cant beat it. However if you have the $$$ look at the ACOG sights, a quick easy to use sight, which also has a 25m zero capability.
 
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