I'm running into a problem with my 6BR. I get a really low ES with 31.2 grs. of VV N150 and great velocity. However, it is a compressed load. I am shooting 108 Bergers and when I seat them I get significant variance in CBTO. 30.5 of Varget is a sweet spot with no compression and consistent CBTO but the velocity and ES are not nearly as good. I've checked all the other variables and it's definitely the powder pushing back against the bullet seating. Other than reducing the powder or switching to a different one, any suggestions?