Evans Gunsmithing
New Member
looks like your chamber was cut with a blunt reamer. Clean throat area and then look at the throat with your bore scope. Were the lands are cut by the reamer should be clean cut with no burrs or goring. If the reamer is not cutting that area like it should there will be flanges in the throat that will scrape the bearing surface of the bullet. This will cause severe copper and carbon deposits. Hope this helps.