Is that the 338/375 LIMP?
If that is a modest and accurate load a guy has to ask himself how much more he needs?
I know a fellow with a 375 Viersco with a 36 inch barrel...I believe it was rolling 350SMKs at somewhere around 3450fps. Though hardly modest the owner (a straight shooter) claimed the gun was holding around 3/4-1 minute at over 2000 yards.
He said it pushes the 260 Accubond to around 3800fps...which would flat let the starch out of a pronghorn