I had this happen to me while at the range one day. A friends Remington 1858 with an after market cylinder in 45LC, home made re-loads. Three shots into my practice, she blew up in my hands. Thankfully it failed as best it could - outward and not towards me. I caught some shrapnel in the face, probably primer lube or grease, but nothing to write home about. The cylinder, which blew into three pieces, had to be pried out of the walls of the shooting stall. I didnt really even notice when it happened, except for the little dink I cought in the face. There was no violent explosion or sound - it just blew up. Weird huh? Upon inspection the walls of the after market cylinder were pretty darn thin, and who knows how much powder was in the round that went off. Note the bent top strap. I felt pretty bad, the gun owner and reloader felt much worse. Call it a draw. Lucky me!