Originally Posted by 1Jn24
Thanks I'll look into this.
I have some telling me 215 is fine for 308, but I want real science not redneck wisdom so I appreciate the help.
It depends on the powder and what you are using it for. It's not "redneck wisdom". There is a method to the madness on this.
I wouldn't use a mag. primer for easy to light powders(single base stick) in normal temperature ranges in a 308, but with "ball" powder or extreme temperatures it's just fine. You need to work up the load with the mag primers to start with though. If you are using an auto in 308, you need to be using mil-spec cci primers in it for 100% reliability, and those are cci mags with a stiff cup.
I shoot in cold temperatures a lot, so I will sacrifice a bit of sd for assurance that the powder will light no matter what.