Doc,
Can't address the last questions but being a lathe-friendly guy: I'd cut off the bbl as square as possible with a saw and then true it on the lathe. Face it off, and then see about crowning it in the lathe. It's probably concentric to bore anyhow. You'll know once you spin it. Your lathe will accept the bbl thru the headstock and chuck, I assume?
Willie
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