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I have seen plans for making a cannon or mortar out of a used hydraulic cylinder. Is this something people up here actually do or is it just a bad idea?
a lot of the answer depends on what sort of cannon you intend to make and how strong a breach assembly you intend to use. One of my cannons is made from 1" ID and 2" OD seamless tubing with the breach plug threaded in for 1 1/2"