Peter-

I'm interested to see the barrel flats - looking at the rib extension I wonder if they're original to the gun.
The rib extension appears a bit different from the rest of what I can see of the barrel set, as if it had been added.

Any way you cut it, it looks like you got a great price on a very cool and fun project!

Tom Armbrust has documented some very entertaining stunts with absolutely massive overloads in rusted-to-death, pitted beyond belief, dented to hell, crap old twist-iron barrel sets on his destruction testing setup, with loads he's tested in his pressure guns -- where the sewer-pipe barrels breezed through the exercise.

I'm sure that whatever that rifle was originally set up for can be run in it once it's put back to proper operating condition again.

This should be lots of fun for you!!

I will note, there's nothing like the sound of a big bore rifle echoing through the crags and canyons of our Northern California mountains, there is little else that will quiet the voices of the hounds...

Cheers
Tinker