Eldon:
You have a grand gun there. Jones lever, too!
The proof marks are Birmingham black powder. When originally finished, the barrels were 8-bore with 10-bore at the muzzles (10M), and thus choked and "not for ball."
This does not mean the barrels are still that way. A professional measurement is the only way to tell.
I trust you already have a padded shooting jacket...
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