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It resembles the "wagon wheel" or "pressed and turned" method of manufacturing used by different producers including the Frankford Arsenal. The bullet may not have been pressed onto the machine fully resulting in the circular marks. On a correctly pressed bullet the six grooves, the ends of which can be seen in your example, would extend out from a center pivot point.
Yeah, lots of no answers, but it's something I sure didn't know about, so learned something today.