So the shaving occurs when closing the bolt. Perhaps the extractor has a bunch of debris behind it preventing it from moving out of the way when it encounters the cartridge rim as you close the bolt so it cuts by the rim. I have never seen a Rem. bolt face like yours with, 1. the surface finish and
2. the additional cut out. Your extractor does appear to protrude a bit more than usual as you mentioned as well.
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