RE: 22-250 or .223 ranges
JOHNCH - have you ever shot any of the AR rifles chambered in the bigger calibers(243, 6mm, 7mm-08, ect...). If so how were they? P.S. -it doesn't sound like your buddies gun has accuracy problems, just the shooter, maybe optics. If the group is tighter at 200 it'll be tighter at 600 unless your talking about huge difference in bullet size where wind drift comes into play.