Ok, I know that with the match barrels with the short chambers it's all a matter of reaming out the chamber with a pull through reamer but how about the chrome lined military barrels? I would think that the chrome lining would chew up the reamer more than it would cut out the new chamber. I have heard rumors that it's just a matter of screwing in the barrel and the headspace is set by swapping bolts to find the right on. That seems like a lot of by-guess-and-by-golly workmanship IMHO and buying a lot of bolts in the hopes of finding the right one would be expensive as well. Any ideas on how this is done? Thanks