So here is the story in this one. A good friend of mine that is not an OCD shooter like most us that handload asked me to look into his factory 270 WSM A-Bolt with stainless steel barrel. He stated the gun shot horrible groups with all types of box ammo. I told him I'd clean it and try to work up a load. First thing of course was to borescope it, noticed heavy copper fouling and a little bit of a carbon ring. After ALOT of boretech patches and brushing I got the bulk of the carbon out. Do y'all think this is the inclusions in the steel exposed during manufacturing of the barrel or is this corrosion? I would assume it goes up wet with gun powder residue in it often. I have one factory barrel which is a 17HMR and it is better than this. The gun has well under 100 rounds and little to now fire cracking btw.
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