Buy CCI Large Pistol Primers Online. CCI 300 primers for sale. CCI 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. Available in 1000 or 5000 count boxes. Buy CCI Large Pistol Primers Online.