I use a round 0.001 on the outside to get me within a few thousands then go to the rangerod internally. It works for me,
Forgot to answer your 2 other questions, The outside will match the inside after it is cut. The crown is done the same way. If I think about it I'll video the next one after I cut the tenon
In the video above the difference is 0.0050 the thickness of a human hair. You will not see that with the naked eye.
Good but not great, I ran out of my good ammo so we are sending it in January to get it lot tested.
I install the truing fixture in the same spot each time to cut down on the time I spend to indicate it in. Think of a 4 jaw chuck and a spider at the rear of a conventional lathe. The truing fixture I slide the barrel in is the 4 Jaw and spider in one. The indicator is attached to the turret and indicated true to the turret. I use a rigid carbide reamer, if it were not perfectly aligned it would snap it off, if it were slightly off enough not to snap, it would cut the rifling off center and you would clearly see and accuracy would suffer. This is not the conventional way to do it it but it works great as I can cut the tenon/chamber and extractor slots in one process and also use the machine to make parts all night long.
dial the bore and let’er rip
