I used an 8mm Swedish rolling block barrel.
Chamber so obsolete, its hard to reload for.
And many were cavernously chambered, that you may only get a few reloads before the brass split.
But the barrel was pristine, with deep rifling, that I had to do something with it.
Fits a 32 cal maxiball like it was made for it. We'll see if the uber fast twist will handle it OK (12 twist)
A 5/8-18 tap, a Tennessee Lollipop tang/breech plug, a Billinghurst underhammer action, some scrap steel, a welder, and a bunch of files and some other miscellaneous items.
Huzzah!