A mate of mine's got a 2 pounder swivel gun.
You want to see real destruction, set up about a half a dozen roughly man sized masonite targets in a loose group about fifty yards away, set that sucker to fire horizontaly, and load her up with buckshot or "Navy" ball!
"Old Growler" (my mates 2 pounder), cuts a swath about two feet wide and ten foot long under such circumstances!