I haven't changed my alloys for PC. I'm not of the school that "harder is better" for non-leading, accuracy, etc. I shoot the same alloy in my handguns I have always used (somewhere between 9-11 BHN) and my lead bullet rifle shooting is new to me and I'm shooting about 13-15 BHN. Cast 'em, size 'em, PC 'em, size 'em, shoot 'em...