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skoomski t1_irtdqaa wrote

You can cast bronze and copper which is not nearly as difficult as forging. You can see long pieces of metal here

https://en.wikipedia.org/wiki/Portcullis

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War_Hymn t1_iryagcr wrote

Yeah, but copper and tin are much less common (hence, more expensive) metals than iron. That's why most cannons were cast iron instead of bronze, despite the latter being a safer material to make cannon tubes out of.

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