They are the equivalent of the CCI magnum primer and have the same thickness cup,(.027) the only difference is the primer anvil is shorter in height which decreases the primer sensitivity and reduces the chance of slam fires. Meaning they are designed for the M1A/M14 rifle with its free floating firing pin. These would be the same type primer used at military Lake City ammunition plant for loading 7.62x51 NATO and the No.41 primer would be for the 5.56x45 ammunition. (.308 and .223)
"Military-style semi-auto rifles seldom have firing pin retraction springs. If care is not used in assembling ammunition, a “slam-fire” can occur before the bolt locks. The military arsenals accomplish this using different techniques and components—including different primer sensitivity specifications—from their commercial counterparts. CCI makes rifle primers for commercial sale that matches military sensitivity specs that reduce the chance of a slam-fire when other factors go out of control*. If you’re reloading for a military semi-auto, look to CCI Military primers.
*Effective slam-fire prevention requires more than special primers. Headspace, chamber condition, firing pin shape and protrusion, bolt velocity, cartridge case condition, and other factors can affect slam-fire potential."
Mil-spec sensitivity, Military-style semi-automatic rifles
Initiator mix optimized for ball/spherical propellants
Available in large (No.34) and small (No. 41) rifle
Use the same data as CCI Magnum primers
View Usage Chart
CHOOSING THE RIGHT PRIMER - A PRIMER ON PRIMERS
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