FWIW I built an AR in -39mm and it shoots ~2" 5-shot groups at 200Y, using Brown Bear bulk ammo. Using PMC 125-grn softpoints and it'll print 3/4 MOA groups. Even used to deer hunt w/ my scoped SKS using that PMC ammo, makes a great handy arm, very accurate and expands well, knocks them down dead. Used it as a straight pull bolt action by removing the piston rod.
Given that 10-shots are a group and 5-shots may be a favorable trend ... know that just one good 3-shot group can make you an instant internet superstar!
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