In the likelihood Jerry is correct, better check your firing pin for damage. Its tip should be rounded and smooth, as a sharp edge on the tip will cut the primer, opposed to evenly and smoothly deforming/stretching it. Failure to eject could possibly be only the beginning of your troubles if you're piercing primers-- pressure in the system outside the case/chamber risks damage to the breech block, firing pin, and anything they contact after they are thrown back extra hard against by the pressure from a pierced primer!
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