This is using 26.2 grs of Rx7, with a 311299 boolit, caste with a mixed alloy of 50% Lead/50% Lyman#2 and a Hornady GC, lubed with Lyman Alox (NRA) lube. I am not using any filler in the case. The case is Winchester, and they are neck sized using the Lee Collet Die. This was shot off the bench, open sights...