I just started shooting F Class in January. The load I worked out for my Savage .223 w/Shilen 28" 1/7 barrel is a max load (25.0gr)of Varget under a Berger 80gr VLD. The OAL is just kissing the lands. This load will shoot sub MOA at 500 meters, easily.

I live in South Texas, where it's already gettin hot. I understand that Varget is supposed to be temperature stable, but I'm wondering just how much reduction will make it safe if I start to see pressure signs. Are we talking 1/2 grain, 1.0 gr, or what??? How much does it take to make a difference, generally?