I haven't shot any roundballs out of rifles. I have a .50 Hawken I shoot conicals out of and it's ok but not real impressive. I want to upgrade it to at least a .54 one of these days. Might try a roundball barrel then. I do use a .58 Enfield with .58 Minies and lemme tell ya, it IS impressive. It'll knock a deer on his a$$. Haven't had one try to get back up yet either.