Sort of on the topic-
A long time ago, I came across an H&R single shot 12 ga. with a cracked frame (behind the hinge). We decided to try to blow it up. Duct taped it to a tree, plugged the barrel, and fired it from cover with a long string to the trigger. Blew about 2 inches of barrel off. Tried crimping the barrel closed. Blew another couple inches off the end of the barrel. Went home, and loaded a shell with some wild charge of Bullseye, and tried it again. The chamber bulged, the fore stock shattered, the crack in the frame got worse, and the gun popped open upon firing, but it did not blow up. I was impressed with the built in safety factor in these inexpensive guns. By the way, this is not something safe to try at home.....
Larry