Thread: superformance powder for 243

I haven't tried Superformance with the 95 gr SST but have loaded 43grs of Superformance with the 90 gr Sierra Game Changer, in my rifle it wasn't accurate ( no matter what powder I have tried) and velocity with the 90 gr GC out of a 24 inch barrel was 2868 fps average. From memory there is more room for higher powder charges, but load up with caution remembering that Superformance is a Temperature sensitive powder and what may be safe in the cooler winter months may be to hot in summer.