[reynolds357]

Originally Posted by Shadow9mm

I have heard of magnum primers being used with standard powders in cold weather hunting conditions to ensure reliable ignition. Generally for use with ball powders. I have found in 223, 308, and 30-06 that standard primers Generally ignite ballnpowders just fine, however the loads can have significantly better sd/es when using magnum primers with the ball powders. And little to no effect with standard powders.

Personally, i would go with all magnum if you can get them. Its so much easier to deal with 1 primers both from keeping them stocked to working up loads .

A lot of factors must be considered. The three following are most important.
Case volume
Powder type
Load density