I just bought a used gen 1 6mm Havak with the McMillan stock. First 15 shots of h4350 Berger 105’s all went under .7’s. I did powder charges of 41, 41.3, 41.6, 41.9, 42.2. The best group was 42.2 and went .4....Im going to go back and load up to a stiffer charge as I didn’t see any pressure...