[bacardisteve]

I have experimented with magnum primers in non magnum calibers and vice versa. It really comes down to the Individual load. I got better es/sd using cci lr magnums in 308 with tac. My 257wby with reloader 26 did best with winchester LR. They are not all created equal either winchester LR primers are "hotter" than most LR primers and almost equal to a cci magnum. I have a chart somewhere from someone who took the time to scientifically check a large selection of primers and document their findings I'll see of I can dig it up and will post it here. The test was solely for primer brisance and hardness was interesting to see the differences between manufacturers.