[quote name=\"bruski\"]Some times you need to turn the barrel\'s between centers with a lathe dog if they are blanks to start with. Nothing worse than having your chambers off center.
bruski[/quote]
I would STRONGLY echo bruski\'s advise on final turning your barrels.
I true the bore centers of my barrels to accept the lathe centers using the \"throat\" section of my .22 chambering reamer turned by hand. I normally will chuck a short bar in headstock and turn a 60 deg. center so it runs dead true to the spindle. I let the tail of the dog drive against the chuck jaw. The tailstock is fitted with a standard live or dead center and the barrels is turned. I use this approach for any shaft where I need all the diameters to run true to each other, especially when the shaft has to be flipped end for end to finish. To face and cut the center tapers, the barrel may also be held in a Steady Rest.
This assures that the bore is at least centered on the two ends. It also allows the barrel to be flipped end for end or removed from the spindle and replaced without indicating or runout.
Works well for me - YMMV.
nitewatchman