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View Full Version : Sighting in a new AR15


Horta
02-24-2011, 7:19 PM
What ammo do you fine folks recommend for sighting in a new AR15? I have American Eagle 55g FMJ and Hotshot 55g on hand. Is there some other ammo that I should consider for this?

surfNshoot
02-24-2011, 7:23 PM
Either if those are just fine. Won't be any difference at 50 yards.

donking
02-24-2011, 7:24 PM
You should adjust the sights with the same ammo you are planning to use for HD or SHTF. Then just aim high/low and left/right when using the inexpensive plinking ammo. This link describes how to adjust the iron sights and also has some good trajectory diagrams.
http://www.ar15.com/forums/topic.html?b=3&f=18&t=328143

CK_32
02-24-2011, 8:32 PM
That all comes into play around 200+ yards.. Under that you shouldnt have to worry unless your looking to get the best group sizes possible.

Horta
02-24-2011, 9:02 PM
I will be scoping the rifle, no iron sights. My goal is to sight in at 200 yards.

sevensix2x51
02-24-2011, 9:07 PM
sight in with the ammo you intend to use most often. if you switch brands for a while, just re-zero.

killshot44
02-24-2011, 9:22 PM
I will be scoping the rifle, no iron sights. My goal is to sight in at 200 yards.

Don't start at 200. Start at 100, then your needed changes to the scope are easier. Depending on the scope one click will move your bullet impact point by .125" or .25". As a plus, it's easier to see where your impacts are without needing a spotting scope.

mattja
02-25-2011, 6:05 PM
Myself, and a lot of other guys, swear by the improved battlesight zero method. I use this method for all my ARs.

Procedure below. You zero at 50 yards, which is even better for us middle-age guys with crappy eyesight. You can use a 7x bino to check your target. You don't even need a spotting scope.

http://www.ar15.com/content/page.html?id=599

Opps, jumped the gun. You want info on ammo. Zero with what you plan to shoot with. If this is a target/varmint rifle with a 1/7-1/8 twist, you might want to use 69gr. or 77gr. SMKs. Black Hills, Federal GM, etc.

If it's a standard rifle or carbine, M193 or M855 would both be fine. If it's a 5.56 cal rifle, you will want to use the 5.56 loads like Federal XM193; if it's .223, the Federal AE will be fine. The 5.56 loads are typically hotter and will affect your zero a little. Not a lot, a little.