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I get these scuff marks when I load a little on the hot side with my .223 and 6.8. These are caused by the ejector scrubbing the case head as they are being extracted. Sometimes it is cause by incorrect timing but most often by bordering on a hot load. If their are no other pressure signs I personally wouldn't worry about it. What clock position does your rifle eject spent cases at. If 3 to 4 o'clock then it is fine and I wouldn't worry about it. If not you may try a different buffer or spring. I also wouldn't go any hotter with the load either.
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