CCI Large Rifle Primers 7.62mm NATO-Spec Military Primers #34 Box of 1000 (10 Trays of 100) are military large rifle primers with a magnum priming mix. CCI #34 primers are ideal for reloaders who employ military cartridges. These primers are deliberately designed to be more difficult to ignite, preventing slam fires in military-style rifles with a floating firing pin. All CCI primers are tested and upgraded on a regular basis. As a result, CCI primers are more sensitive, easier to seat, and more compatible than ever with progressive and automatic loading equipment. For the cleanest burn possible, they use current non-corrosive and non-mercuric initiator blends.