I have 2 223's, I shoot Nosler Custom Competition 77 gr in. One is a Tikka T3 with 8 twist, it likes 23.8 gr. of Varget. The other 223 is Savage Model 12, with a 7 twist and it likes RL-15 at 23.4 gr. also 77 Nosler CC bullets. Both guns will consistently shoot 1/2 inch groups when I do my part...