At CCI their 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. Some real-world shooting conditions require more aggressive initiation than provided by standard primers.
Large cases, cold weather, and certain propellants often require a hotter primer flame and a longer burn. CCI Magnum primers offer you that edge, plus you get all the attributes that make all CCI primers so great.