I would suggest you get a number of different pure lead conicals. Then see which one of them your rifle shoots best with the strongest powder charge possible. The most accurate, and heavy would be the best. Some ones to look at would be maxiball, great plains, bull shop, no excuse, or you could also consider some powerbelt or saber tooth if they are legal. Just get an accurate one with a good powder charge and let the conical do the work.