I gmailed Samco concerning my problem and here's their response:
"The nato 7.62x51 round will be stronger than the average win. .308 round the military cases will be thicker to compensate, but you should return it anyway so the headspace can be checked and corrected as needed. We can send you a call tag if you like. So you can return it back to us either for exchange or repair. Let us kow if you have any questions."
Whatda think.... send it back?
Can't hurt, right?