I know some folks are going to say "You don't need to break in the barrel." But I'm going to do it anyways. I'm going to shoot, then clean for the first 10 rounds. Then shoot 3 and clean, 3 more and clean, final 3 more then clean. I have 3 copper erasers powders. CFE 223, AR COMP and IMR 4166. Anyone better than the others After break in it will be Varget and 165 SGK's. Thanks