There are now two videos of 12GA FH on YouTube,
exploding big heavy walled pails of water.
The "Grampa's Cannon" one with a long view,
and "Grandpa's First Shot" a closeup video,
the first one, that shows how the top of heavy
shelf got bent. Later kids will do videos showing
muzzle blast and recoil.
Also the 3 ought buckshot from the 8ga load
above goes through 2" hardwood ok. I will test
8ga on waterpail also, to see what happens. Ed