What is the point of your using a muzzleloader in the first place, wouldn't you get more satisfaction out of using a centerfire? I know of many hunters who can't make a clean shot with a scoped modern gun.
I have no trouble taking a deer with a round ball, I know the limitations of my equipment, and myself. The hunter who wounds and cripples with a muzzleloader will do the same with what ever he uses during rifle season.