cci 450 primers (Small Rifle Magnum Primers).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.CCI Small Rifle Magnum Primers #450 Box of 1000 (10 Trays of 100)