It is a universal test receiver ammunition test barrel you are see the short clip on.
I hate it when guys ask how we chamber, the set up, speeds, feeds, cutting oil etc....well I shouldn't say I hate it but you run into the guy that goes off on the deep end on me/us etc....and say it's wrong this, wrong that etc....were always looking for a better way, quicker etc....
Threading and chambering a barrel is like cleaning a rifle. I tell guys if you have a set up/method you use and you are getting concentric chambers with little to no run out, the guns shoot well just because one guy doesn't it differently and it work for him then I've got nothing to say. Just because the guy next to you does it different also doesn't mean he is doing it better etc...
Going thru the headstock and locking the barrel up tight per say is fine if your set up is good etc.....
Something has to float/give in my opinion. The reamer has to follow the bore. Any error in alignment and you egg shape the chamber. Some guys use a floating reamer holder, some guys hold the reamer with they're hand with a vise grip and use the tailstock to push the reamer etc..... Again what ever works for you.
The ammunition test barrels we make we have not had a single one ever come back because of a chamber issue. To also give you a further example...on some of the test barrels we make (three different calibers) we have to inspect the chambers with 10 different ball gauge sizes. We have to check the diameter of the chamber and the depth at that location. Two out of the 10 different tolerances we only have a .0008" tolerance.
Were using a method that works for us and gives us the quality we need in a timely fashion. Ask this question. Now many gunsmiths check/inspect the chamber size starting all the way up in the throat and back to the breech face with 10 different gauges? Yes we only do this for some of the test barrels we make as it is part of the requirement/inspection process that we have to make the barrels to.
Last bolt gun barrel I did for one of my rifles the run out in my chamber, fired cases etc...how ever you want to measure it is a .001" or less the best I can check it. The gun shoots to boot as well!
If there was a major problem with the set up we would see it but we don't. Is there a better way to do it? Probably....and will keep looking for that better way.
Later, Frank
Bartlein Barrels
