a rather crude CAD drawing i whipped up... anyone ever done a design like this? the only thing i can see there being trouble with in construction is cutting out the track for the bolt to lock into.
other than that, turn a solid piece of stock to slip fit the barrel, bore out the powder chamber, bore a hole for the piece that follows the track (i'm rusty on my gun terms...), making sure that it will result in the back of the bolt being flush with the back of the barrel, re-enforce the part of the track that the bolt would put the force against, and then attach a handle to the back.
what do you guys think?
purpose: easy cleaning, disassembly, reloading, emptying, exchanging of powder chambers, and so on. no welds to break
problems i can see would be the track in the barrel wearing out and getting all loose depending on re-enforcement and/or the quality of steel used. also might be a hassle to get to if you have a more vertically-firing gun.... this would be a good design for a little cannon that fires more flat, in which the breach can easily be accessed.
this might be a fairly common thing that is done in cannon designs and i just don't know it.. after all i am a noobie.