The thing with the 230 / 240 GR 30 cal bullets in a win mag chamber is without a custom chamber with the throat pushed way out they are 2600-2650 ish fps .

The military load with the 230s IIRC are stupid hot and not something I'd want to have to support on my own dime .

The 300 WM is probably best used with something in the 200-210 GR range to balance usable velocity and bullet performance .