I have a ballistic twin to the 300 WSM
: my 30-338 Win Mag.
I shoot this in a 16.5" Encore barrel and get the following:
Berger 175 VLD @ 2846 FPS
Nosler 180 BT @ 2800 FPS
Hornady 165 IB @ 2826 FPS
The 300 WSM should, in similar length barrels, do virtually the same.