I've got a Sig Sauer 516 and I'm only get 4-5 inch groups with it at 50 yards. I've shot federal 55gr. 5.56 fmj. Hornady superformance match bullets 72 gr. 5.56 hollow points and didn't get as good a group as the federals. I've shot Winchester pdx1 223 defenders and got the best group out of them(still not very good) but I'm looking for a 5.56 or .223 round with around 60-70 gr. lead and more powder than the defenders, they're too slow. I'm open to reloads, I've got all the stuff for it.