Sweet, yeah that's how I did it. Love the golf ball mortar and black powder cannon! Might have to make one myself. Any legality issues around building one of those?
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It's a good feeling when your first ever hand loads don't blow your head off.
No legal issues other than that which applies to any other standard fire arm.
Cannons are not endorsed firearms.
Drop me a line if your thinking of building a cannon and I'll fill you in on some design features and dimensions that you will need to know.
Cheers
Pete