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Message: <blockquote data-quote="Shinneryfarmer" data-source="post: 4386540" data-attributes="member: 46291">Also looks like a burr at 4 o'clock. A 1/8 wood dowel rod wrapped in fine emory cloth chucked up in a drill does wonders. Tape end of emory cloth or cut a slot length wise down the middle of dowel rod length of emory cloth width. Have cleaned up a many of chambers with issues using this method.    Had a AR10 .308 chamber awhile back that you thought they hammered it out with a punch. It was a friends that had no spare change to replace. Every shot the case would stick in chamber. I polished it out starting with 220 grit working up to 1200 grit. When I was done chamber still measured in spec and problem alleviated.</blockquote>