here is the set up I did for the 444??? barrel. this blank was a non turned blank and the bore was not only out of center by a mile it ran at a angle through the blank. the od of the stub was like 1 1/4 .
the muzzel end is on a drill bit shank and driven with a dog. the breach is on a live center. I was able to turn the OD true to the bore. It damm near shook the lathe apart the barrel was to ut of balance that I ended up hose clamping a lead wheel weight to it to help balance it out. I got it down to 3/4" except for the shank so I can now chuck it directly and put the barrel through the spindel and chamber it. the barrel is long enough that I can profile it and not hit the dog Ill just cut it to length last.