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Message: <blockquote data-quote="Shinneryfarmer" data-source="post: 3791067" data-attributes="member: 46291"><p>Had a 308 that was having sooty and black cases and on occassions hard to extract. I bought the gun used and on further inspection noticed a burr embedded in the chamber just before the neck. Took 1500 grit sandpaper wrapped around a 1/4 inch dowel rod inserted in a drill and about 2 minutes to clean up chamber. Issue solved, I believe the embedded metal was machine shavings left in chamber and gun wasn't initially cleaned before firing. It was very hard to see with the naked eye also used magnifying glass to spot it.</p></blockquote><p></p>