Sorting through 9 mm range brass (3,000+ cases) .. these show up .. Primer Pockets are smaller diameter than “regular” 9 mm brass. In my current batch average pocket ID is: 0.1725” .. these two examples are 0.1690” .. only 3 1/2 thou but noticeable when cleaning with reamer and wire brush. Looks like a Winchester NATO stamp: Cross in a Circle and the 11 is a two digit date code. .. I’ll keep these separate for priming.
For Ref the SAAMI Specs: Pockets and Primers:
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