Re: What would happen?
I have seen a barrel that was cut in half after someone fired a squib and followed it up with additional shots. There were five bullets wedged into the barrel, neatly compressed against each other. The barrel was bulged but did not rupture.
"...As to the species of exercise, I advise the gun. While this gives a moderate exercise to the body, it gives boldness, enterprise, and independence to the mind. Games played with the ball, and others of that nature, are too violent for the body, and stamp no character on the mind. Let your gun therefore be the constant companion of your walks."