The extractor on the Rem 700 will sometimes remove the sharp edge corner off of a cartridge rim when the bolt is opened and a cartridge is extracted.

Unlike the Sako type extractor, which uses a claw to grab the rim, the 700 extractor is the circular spring steel thingy/doo-dad under the rim of the boltface, held in place by a teeny-tiny rivet.

When the bolt is closed the extractor expands slightly to fit the case rim and grips it in the groove between the case rim and the case body. When the bolt is opened and is pulled back, the ejector spring pushes the case to the right, and the extractor springs open slightly allowing the case to pop out and sometimes removes with it the sharp corner edge of a case rim.

These small sliver shavings of brass usually fall down in the magazine. Some find their way behind the action lugs over time and must be cleaned out occasionally with the proper tool.

If you use a light bolt grease on the bolt lugs as you should, the grease holds these tiny shavings and sometimes causes the bolt to close harder than necessary.