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Reading primers can be tricky until and unless you've seen a few that were definitely overpressure victims. A better and earlier sign of overpressure is case head expansion. It's a lot more definite and easy to spot, if a little time consuming. You must be sure to mic the case head just above the extractor groove and measure both before and after you shoot a suspect round.
ARs have a tendency to produce scary but false indications like slightly flattened primers and some very slight embossing of the case by the bolt face. You do know that the V-max is not a match bullet?
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"If the enemy is in range, so are you." - Infantry Journal
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