smokeless powder in a muzzle-loader
http://www.outdoorhub.com/news/2014/...oters-fingers/
The man who fired the gun loaded the muzzleloader with smokeless powder which had been taken from 20 gauge shotgun shells,” Doane said over the phone. “He had run out of black powder and had actually cut open the shells and ended up pouring 75 grains of powder into that muzzleloader. Once again, smokeless powder is several times more powerful than black powder, so it would be like putting a 300-grain charge of blackpowder into a muzzleloader.”