Fine looking rig. You might try some different 55 and 62gr military ball also. Never can tell, it might like one of them. Most of what's available is imported, but Iv'e had some luck with Brit and Israeli 62gr and white box Chinese 55gr. I don't know what the rifling twist is, but I've seen this stuff do better than 2 moa in barrels from 7 to 14 twist, and 1 moa in some.
IMO, I'd start out on the 3.5 X on your scope, it'll get busy after the first shot, and the field of view at 10 X may be too small to keep track of several animals at under 200 yds, or to make follow-up shots on one. Be sure that the scope is the right height to come up naturally and be looking down the pipe every time.
AR's are capable of fine accuracy and excellent for fast recovery between shots.
Good hunting, Tom
Texas State Rifle Association Life Member
NRA Endowment Life Member
A big fast bullet will beat a little fast bullet every time