Just read on another forum where a guy run out of black powder and cut some 20 ga. shotgun shells open and took the powder out of them to shoot in his muzzle loader. They loaded 75 gr. shotgun powder in a muzzle loader and said it done ok the first shot but took 3 of his fingers off when it blew up the second time it was shot. He was able to get one finger put back on but still lost two fingers. He was a lucky man to not have more damage than he got.