Yep ! First bolt I ever had to hammer open was a 257 AI load with Win 760 .It was a 100 degree day and I inadvertantly let the fifth or sixth shot in the string cook in the chamber .
I burn a lot of RL powders . I've done my own temp tests to MY satisfaction .Only difference I've seen with any powders is that Varget handles the heat better in my 22 250 AI than anything else I've tried . Important in a PD rifle .
