I make my own slingshots using thera-band gold exercise rubber.They are more powerful than the wrist rockets(I have a couple of them too).I have taken squirrels with them using .350 or .445 lead balls.Here are 3 of mine.
I've used the 44 magnum plastic bullets before.After about 40 rounds one got stuck in the barrel.They seem to be dirty so run a brush through once every few rounds.
Qball-Really like those husky barrels on your cannons.Look powerful.Vrichard-I really would like to acquire a winchester cannon but the prices I've seen are a little salty.Maybe I'll get lucky and find one at a yard sale.
The barrel is 15" long 3/4" bore. I bought it on E-Bay.Built the frame out of 3/4" plywood.I have just been shooting blank loads out of it(really loud)Most people whose cannons explode were trying to shoot projectiles out of them so you have to be careful.Load it like a muzzleloader with...