JM,
Primers can cause slamfires in the M-1. Remington 9 1/2 standard large rifle primers meet Milspec. They are the same primers Remington loads in their military ammo.
I've heard that CCI makes a special order primer that meets Milspec, but I'ver never seen one.
If you're eliminated other possibilities, change primers. In facxt, it might be a good idea to change primers anyway.
I will use nothing but Remington Milspec primers, 9 1/2 large rifle, and 7 1/2 small rifle in any ammo that I load for military rifles.
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If you think a mighty military force is expensive, wait 'til you see what a weak one costs.
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