I use Brownells lapping conpounds 600 and 800 grit. I apply this to lead bullets, by rolling the bullets and compound between to steel plates. Then these bullets are loaded in the (breach) of a muzzleloader barrel, with enought powder to get then out of the barrel. After you have your powder and bullet loaded from the (breach), take your ram rod and make sure your bullet is seated on your powder before shooting. I shot three rounds then I clean my barrel. I keep doing this untill I get what I want. About fifteen rounds.