Number 41 Mil-spec primers are made to the same specifications of the U.S. Military and reduce the chances of a slam-fire. While designed for you in Military-style semi-auto rifles, they use the same data as CCI magnum primers.
Note from CCI:
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Primer orders ship separately and may arrive at a later date. $19.99 Haz Mat fee added per order. Primers ship ground freight to the 1st 48 states. 70 lb max per order. Primers cannot be returned. Check local regulations.