Buy CCI 35 Primers in Stock Now Online. 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 50 bmg primers before. Buy CCI 50 BMG Primers Online. They utilize modern non-corrosive and 50 bmg primers non-mercuric initiator mixes for the 50 bmg primers cleanest burn possible. Buy CCI 50 BMG Primers Online.