I used to shoot factory 160 Sierra Gamekings when Federal loaded them, but did not like how they performed on game. Went to 160 Accubonds when Fed started loaded them (this was all before I started reloading), then tried Bergers, and haven't looked back.
I tested some 160 Game kings this evening, using 75 G. of RL 25 in a remington 9 1/2 26 inch barrel. Started coal at 3.625 working up. Best accuracy was at 3.685. Touched the lands at about 3.695 coal the sd increased and lost some accuracy.