Had a Colt Sporter H-Bar ( Ca name for AR-15 with out Bayonet Lug) Bought it back in 92 I bet since then I've easily fired 5,000+ rnds . Well I use to get MOA at 100 with 69 gr Sierra MKs . But that was history. I was lucky if I got 2MOA at 100. 1 1/2 with 55gr pills some times. So I bought a Rock River Arms Coyote upper. Shot some blue box Black Hills 52 gr Match ammo and my 52 gr Speer HP reloads. Both loads I was getting well under 3/4MOA a few yes a few groups were under 1/2MOA at 100 yards. Also shot some Fed Match 69 gr Sierra MK and those were right at 3/4 MOA. So thumbs up for RRAs products.
RRAs Coyote upper
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Posted 30 December 2007 - 09:32 PM
He must be shooting a Match bullet . There are no 69 gr Varmint bullets. Sierra doesn't recommend MK for hunting. 223 in a AR-15 isn't as fast as a Bolt action not just because the BBL is shorter but because a AR-15 action can't take the pressure of a bolt. Action will start to unlock too soon. Right now I'm loading some 52gr A-maxs for a hope full MV of 3150. Maybe that will be a 200 yard coyote load.
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