I have a pre-war Mauser single shot, very nice little rifle, but it has a bulge approximately half way the bore. It shoots 3 to 5 inch groups at 50 yards. I'm thinking it would be a candidate for relining. Can anyone suggest who might be able to do a good job on this and approximate cost? I have no clue. Is there any good reason not to do it? I'd kinda like to save the old girl. Thanks in advance.