Check with Rich Pierce, he was doing some. He might have learned his lesson
Dennis
It’s me. I’ve learned a few reasons to avoid certain barrels unless willing to cut some off the breech and possible muzzle. If the powder chamber is burned to where it has zero rifling we are looking at over 20 hours of work. If the muzzle is relieved over 0.010” and we want uniform diameter to the muzzle, same story. Cut 2-3” off or it becomes a big job.
The rifling must be strong enough to act as the guide for the cutters.
(Undoubtedly not your interest, Ron) - cannot do button rifled barrels. They are work hardened.