Re: AR trouble. Equipment failure? I have the Rock River A4 Varmint 20", and it shoots 1/2-3/4 moa with my handloads. It is a 1/8 twist barrel. 69 Grain nosler, H335, CCI small rifle standard primers, win cases, 2.265 oal. My friend has the same rifle exactly, and uses 69 noslers and...