CCI’s primers are highly-evolved products because they continuously test and improve. Today’s CCI 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 rifle calibers like 270 WSM, 357 Wthby Mag, 264 Win Mag and many more.