Rich,
How did you figure the center on that brass insert? Do you have drawings of the bolt, or did you reverse engineer it? I was thinking about making a tight fitting insert, then turn a centering punch that fits snugly in the barrel and mark the hole from the inside. Once the hole is drilled, it would be easy to center and drill the taper for a live center. However, there could be a few sources of error (like a rough bore and a partially unsupported punch), so I don't know if that will be accurate enough.
Anywho, if you already have the dimensions, I'd be very interested.
Bill,
If I recall correctly, you don't have a mill. I can just as well make two inserts while I'm at it, it won't take much time to do this once everything is figured out and set up. It has been a while, so I'd be more than happy to trade it for a "gun and BS session", either here or at your house.
