Ditto what Smokepole said.I have probably killed 10-12 elk with them. I also use 370 gr Maxiballs in my side lock and black power too when I feel like plugging a heavier rifle around.
Push the Powerbelts too fast and you will have problems similar to any other pure lead bullet.If you like to stuff 150 grains of powder in your ML then you probably better find a tougher bullet.
Muzzle Loader hunting is just like center ire rifle hunting. It is more important as to where you place the bullet in the animal than what type. Even more so since you don't have a follow up shot if you screw up the first one. You can't go wrong with the heavier bullets
