I just bought my first 6mm br a used remington 40x. I need some help working up a load, the information is geting to me. I have re-loaded .308 for too long i guess. The rifle is a 40x built around 1999-2000 factory 27" 1 in 9 twist. what is the lightest and heaviest bullet i can shoot. The previuos owner had great results with h322. Any thoughts? Sugestions?