Home Forums Reloading Big Game Rifles Mag primer with 7977?

I'm looking in the Hodgdon 2015 Annual Manual (Magazine) and it has a long writeup on the new Enduron powders. And test load data is given for all three of the newer powders. And the laws of physics haven't changed with slow burning powers and large cases. In the IMR 7977 test data the standard calibers for the test are using CCI 200 primers and the magnum calibers are using Fed 215 primers.

Do you remember the 1966 hit song by the Doors "Light my Fire"?
It sounds the same now as it did back then, and nothings changed. (except all my vinyl records are scratched)

The real question is what is a magnum primer.