CCI 500 Primers are continuously tested and improved. As a result, today’s CCI primers are more sensitive, easier to seat, and more compatible with progressive and automated loading equipment than ever before. They utilize modern non-corrosive and non-mercuric initiator mixes for the cleanest burn possible. These are the “bread-and-butter” of reloading, the most commonly called-for primers in reloading recipes. CCI standard primers are remarkably clean-burning, leaving primer pockets cleaner and extending the time between pocket cleaning. That’s a huge benefit for progressive reloaders. They are more sensitive and easier to seat than older CCI primers and engineered for smooth feeding in automated equipment. Available in 1000 or 5000 count boxes.