wdr0 wrote:Yes, you can use threaded metal pipe, there are a number of other joining methods for metal piping not involving welding as well although likely out of your price range. As another note, it might be beneficial to make the effort and find a welder. I've built a large cannon out of sch 80 pvc and another out of welded steel. The steel weld fittings were cheaper than pvc by far in the larger sizes.
That is great to hear, it means my utter lack of appropriate tools, experience with welding and machining, and cash won't completely hinder this project!
Going to use seamless stainless steel, sch 10 for the barrel and sch 40 for the chamber. This gonna be a beast, at least by my low standards!