Roger- my post attended to that. The fellow had a loose fitting lock (against the barrel), he dribbled powder into the vent to clear the dry ball with much powder going down into the lock mortice. Upon firing the piece, the powder in the lock mortice ignited, blowing the lock off the rifle. The same sort of deal happened with the Hall rifles when used with loose powder and ball, and to some extent with early Sharps cap locks, ie; powder getting dwon into where it shouldn't be and ignition makes for surprises. I thought everyone knew that or would have explained my post about lock fit a bit better. Anyway, that's my guess.