not trying 2 be a azz here but that data is wrong we get 3400fps with the 300 wby with 165 gr hornady 95 plus gr of poweder.
its not how much goes in the case it is what is most afficent out of the cartidge.u have 2 have case as full as u can get it 2 be the best round.and 2 do that u have 2 play with dif powders 2 get the case as full as possablewith little case presure