Paladin132

I am wondering does anyone know why the military zeros at 25 meters? Is this supposed to catch the bullet on the rise to a certain point and then on the drop at 300 meters? At what point does one have to hold high / low to hit center mass? Amazing as it is, no one ever explained it to me.

On the same point, what does everyone zero their battlesight to on their AR? Iron sights and red dot optics, or 3 or 4 power but not the more rifle scope things most people think of, but battle optics?

Roadrunner

They zero at 25 meters because it's a lot easier to walk 25 meters to check the target than it is to walk 100 or 200 meters. Zero is performed with the elevation knob at the "8/3 +1 click" position; for the actual 300 meter range, the knob is moved back to the 8/3 setting to compensate for the increased range. If you forget to move the knob back, it's very hard to hit your targets on the 300 meter range.

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aus71383

Marines zero at 36 yards which puts them dead on at 300. I think the Army does the 25 meter thing....not sure what exactly is going on there. If you zero at 50 yards you should be dead on at 250....also a good way to do it. One click on the elevation knob is 1" elevation (on an A2....on the A4's its 1/2") for every hundred meters - so 8/3+1 at 300 meters is 3 inches different than 8/3 at the same range.

Basically the sights are about 2.5 inches above the bore, so at 7 yards to hit the target you need to "aim" 2.5 inches low - in reality the bore is pointed straight at the target. At 36/50 you'll be dead on (depending where you zeroed) and past that you'll be within a couple inches of point of aim out to 300/250.

Austin

BAC

The 300 yard zero is (finally) starting to fall out of use (ala new Army training proposals; not sure when they're supposed to be implimented, but soon). The 200 yard zero is likely a lot more relevant in modern combat, because most engagements are occuring anywhere within that 200 yard range, and a 200 yard zero provides a flatter trajectory and better chance of hits within the 200 yards than the 300 yard zero (which accounts for more of an arched trajectory).


-B

OPFOR

The answer is in the OP - it is because you will be on at 25 AND 300 (25 as the bullet is rising and 300 as it is decending, with the path of the bullet never being outside of a normal human torso during its flight).

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Sig 210

US Army used to call it the 1,000 inch range. When Kuwait got invaded i was the senior Saudi firing range advisor. Saudis used the FAL and the G-3 and zeroed at 30 meters. US Army units had no end of heartburn over the five meter difference.

buckeyeLCPL

Our RCOs (Rifle Combat Optics) are set at 4X, and we zero them in at 36 yards. They have a built in bullet drop compensator within the reticle, once you get it set, you are good to in in theory out for several hundred yards.

As far as why 36 yards, OPFOR hit it.

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Longbow

I know that with the 762x39 AK, SKS you battle zero at 25m, this will keep you on a torso size target 19" circle from point blank to 300m. When with these rifles you have your battle zero set, you can then use your 100m 200m site settings and so on and you will be on.

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Paladin132

OK, let me refine the question then please into a realm that i know nothing about. I assumed the bit about 25 to 300... What about optocs, such as the red dot aimpoint or the x3 and x4 acog?

Ram Rod

Alot of info, too much to list or link. Terms to remember, Line-of-sight, and Point of impact.
zeroing the ar-15 for battle - Crawler.com

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