Reply by SirBrian

You know, I have a a very rare 1936 Craftsman badged Atlas 12” inch metal lathe that is 42” inches between centers-you can see the actual lathe here,

http://www.lathes.co.uk/craftsman/page17.html

I could make my own,,,,,,,,,,,,,,I bought that lathe a couple of years ago and completely rebuilt it. I never thought about making black powder firearms, but now that you have sparked my interests I may give this a whirl. The over-all cost would be low due to me doing most of the machining on the barrel and I could definitely make most of the parts. Why didn’t I think of this? Brain dead?
I would still have to buy one complete unit to use as a reference to build from, but that would pay for itself after one or two sold.
It would be a lot of extra work, but it would be fun.
Thank you TS for the idea and the links!

-- Anybody can become a woodworker, but only a Craftsmen can hide his mistakes! - Walter Blodgett