CCI 0016 Magnum Pistol No. 350 Large Pistol Multi Caliber Handgun 1000/BoxCCI primer is more sensitive, easier to seat, and more compatible with progressive and automated loading equipment than even before. CCI primers have always incorporated modern non corrosive and non mercuric initiator mixes. This primer is compatible with large magnum pistol calibers like 475 Linebaugh, 500 Linebaugh and more.