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- Exist
So, looked it up online and it looks like Bronze was actually the preferred metal for cannons until about the 1900s when nations could really increase quality control on iron cannons. Also Bronze seems to be safer when it fails (the barrel would tear long ways rather than the back just exploding) than iron, did so less often, and due to construction stuff a bronze cannon was actually lighter than an iron cannon of similar barrel width. It just wasn't used as much due to expenses. There might be a slight issue of continuous fire... But magic could probably sort that out.