[null and void]

Back in the day of crappy steel, some cannon were made of relatively thin steel barrels reinforced by winding miles of steel wire around them.

Any flaws in the steel were stretched out along the wire and therefore didn’t provide enough of a stress concentration to make the wire fail as a solid block would have.

Fiberglass or graphite fiber could serve the same function on an all plastic barrel.

[JRandomFreeper]

Stave cannons. Yep. Cheaper than bronze cannons, and your churches didn't go silent every time you had a war.

/johnny