Impressive, as usual!
You think it would it be safe to do a conversion 9mm? I have a sad looking Bolo that's begging for a project, so a new 9mm barrel might be the way to go. I have been eyeballing the chamber area, but there seems to be very little meat for drilling, threading and all that. I was planning to cut it further back, just in front of the chamber, and maybe sweat and pin it to leave as much steel as possible intact.
Another idea I have been tinkering with is to convert it to .22 Mag. I think it could make a fun and accurate plinker, but it may be a bit sacrilegious.