Human error 99% rifle malfunction 1% Savage did extensive testing of their muzzle loaders and recommended only certain powders. People tried to push the limit duplex loads etc. I have shot the Savage more than I can count w/o any problems. I now shoot a Remington/Brux 45 caliber 70 grains of IMR-4198 with various 250 to 300 grain bullets. I have watched many video's on shooting these Muzzle Loaders and yet to see only a few stress the use of a witness mark. Proven tested rifles don't blow up on their own people blow them up by unsafe negligent loading Good Luck and Good Hunting.