Im pretty new to making firearms, but I make a lot of other things. This may be a dumb question but can you use steel tubing as a smoothbore gun barrel? Ive seen the like done for black powder pistols and even shotguns on youtube. The old flintlock barrels were handforged right? And to my knowledge they werent hardened either. Some were even cast from brass or bronze. I know that it wouldnt handle the kind of pressures we see in smokeless powders but would a piece of DOM tubing with a 1/4" wall thickness work for say a .36 cal black piwder flintlock? And would it be safe or would I be risking a grenade to the face every time I pulled the trigger.