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.
23 percent hotter flame than standard primers
Increased flame duration
Initiator compound engineered to ignite ball/spherical propellants
Improved sensitivity for “critical-need” loading
Large capacity cases
Ambient firing temperatures below 20° F
Usage Note: Use Magnum primers only where called for in published reloading data