Don't get me wrong but there isn't a lot wrong with threading on the tail stock as long as everything is locked up properly. I have personally had more than one issue with an off center of axis bore. On a blank from Hart that I chucked up in the head through the spindle/spider. Everything dialed in beautifully on both ends to .0001 but something just didn't look right. I used a spud in the end protruding over the bed and sure enough the bore was .005 off center. I have absolutely no idea how that could occur but there it was, right in front of me. I ended up taking off the chuck and putting on the face plate and center. Then with a dog leg clamped on tight and the tail stock equipped with a live center, proceeded to cut the threads at the tail stock, which gave me a set of threads that were cut to the axis of the bore. This could easily have screwed up what turned out to be one of the best match rifles I owned. I can see this happening to a hammer forged barrel but I believe Hart cuts their rifling.
I could have just sent the barrel back to Hart and they may or may not have replaced it. By being able to set it up between centers I saved a month or more of time waiting. Now, when I turn down a blank to the dimensions I want, I check both ends of the barrel by chucking up one end and running the live center of the tail stock into the bore and checking the concentricity with a dial gage over the live center. I have only had one other barrel that had the bore off center and that was on a rimfire take off barrel.
That's why I recommend a long bed if you have the room. Small hobby lathes are OK for small light work but when push comes to shove often the money saved can be lost on just one project and it won't even be the fault of the lathe or operator. A match grade Hart barrel blank runs close to $600C right now.
I could have just sent the barrel back to Hart and they may or may not have replaced it. By being able to set it up between centers I saved a month or more of time waiting. Now, when I turn down a blank to the dimensions I want, I check both ends of the barrel by chucking up one end and running the live center of the tail stock into the bore and checking the concentricity with a dial gage over the live center. I have only had one other barrel that had the bore off center and that was on a rimfire take off barrel.
That's why I recommend a long bed if you have the room. Small hobby lathes are OK for small light work but when push comes to shove often the money saved can be lost on just one project and it won't even be the fault of the lathe or operator. A match grade Hart barrel blank runs close to $600C right now.