I have had no trouble getting decent accuracy with Hornady 220-grain round-nose bullets from a Win. M70 in .308 Win, which has a 1/12" twist. This twist may be too slow for a LONG pointed 220-grain boattail, but it is OK for the shorter, RN version. My load was 48 grains of Norma N205, MV around 2300 FPS. Great VA swamps deer load!