WCChapin | Datum Dilemma – Measuring Fireformed 7.65×53 Argentine Mauser Brass

Small defects in the case head surface, and even the headstamp itself, can affect comparator measurements. A tiny nick on the edge of the primer pocket of one of these cases added a few thousandths to the reference dimension.

I often lightly shave case heads on the L. E. Wilson Case Trimmer during case prep to remove any high spots.

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