A moose hunter I guided had one of them. He'd put a ball in his hand, and pour on enough black powder (goex ffg) to cover the ball. That did the trick, as Cayagud confirms, a 56 inch bull did not "walk off". He tried to, but went down after a very brief stagger. The bigger diameter ball you have should work just fine in 1 in 48. If I didn't need a scope, that caliber (at least) and round ball would be my choice. Just plain fun to shoot those RBs. Beats heck out of the cons.