In 1979, I bought a Harpers Ferry 1842 percussion musket from a pawn shop on Oahu. It had been "sporterized" so we were not too concerned with hurting it's value. (If I bought it, you can bet it was cheap.) Being the drunken sailor that I was, Jim Kroschell and I ordered some cast round balls from Dixie, drove up into the mountains above Makaha and shot it numerous times. Later, it fell off my makeshift gun rack and hit the floor. The barrel was bent noticeably. After I finished cussing myself for allowing this to happen, I stuck the barrel into my VW's bumper, and it straightened easily. As someone said, the barrels on many of them are very soft. Today, I would not shoot it as there are too many contemporary muzzle loaders within reach.