Electric BP breach loader is WIN

"I fired a round from a clean barrel into a water trap to see what happened to the ball as it was swaged into the rifling. A second round was retrieved after firing it through a barrel fouled by about 20 shots. The picture below shows how the ball swaged into the clean barrel has a smooth surface and crisp rifling marks, but the ball fired through the fouled barrel looks pretty crummy."

That little bit right there shows the fallacy of "Ballistic Fingerprinting".