The CCI 34 primer is the most advanced yet. It is more sensitive, accessible to seats, and compatible with advanced and automated loading equipment than ever before. CCI primers have always used modern non-corrosive and non-mercuric initiator mixes in their formulations. Firing pin retraction springs are uncommon in military–style semi-automatic rifles. A “slam-fire” can occur before the bolt is locked if care is not taken in assembling ammunition. In military arsenals, this is accomplished by utilizing methods and components that differ from those found in commercial ones, such as different primer sensitivity specifications. Because of their military-grade sensitivity specifications, CCI’s commercially available rifle primers are less likely to fire when other factors go out of control (accidentally). CCI is an abbreviation for the military primers ideal for reloading military semi-automatics.
Reloading’s “bread-and-butter” primers are the most frequently used in recipes. As a result of the CCI standard primer’s clean-burning properties, primer pockets are left cleaner and more regularly cleaned. Progressive reloaders will significantly appreciate this benefit. Older CCI primers are more sensitive and more accessible to seat than the newer formulations.