Re: Saving a tired barrel?
I doubt any "bore maintenance" or fire lapping will improve an already fire cracked barrel. With only 350 rounds, it should not yet need rechambering. My BR gunsmith told me this some time ago: If the round count is moderate, and the bore is otherwise in good shape, it can be rechambered. If you wait until it is shot out, you would be wasting your money (about $150). I had a Hart barrel in 6 ppc rechambered with 1,500 rounds thru it and it shot very well thereafter. Expect about half as much life in that barrel after it is rechambered.