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Except for the stripes, they resemble what I see when starting out the development of a new load where none of the reloading manuals have exact data for a new bullet I'm using (something that has happened a few times in the last few years.)

Starting out at 10% under the published starting point for the closest thing I can find in a manual, the round will often not have enough pressure to expand and seal itself in the chamber completely, resulting in carbon getting into the chamber and on the cartridge. The low power load will also often have problems cycling a slide, where the cartridge will get extracted, but not fully ejected, and the mouth of the thing will get slammed against the lip of the barrel as the slide closes on it, creating the dent.

Given the indications of a fluted chamber, I would guess someone is testing a subsonic round they loaded up for their HK.
 
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