Really. I suggest you look at the current military issues.
Speed has nothing to do with accuracy at that range. In fact, if IIRC, 338 outperforms the 300 at that range and both are sub moa.
If you have shot either, you would also know that subjectively, the 338 recoils less. Impulse you know.
Your knowledge of firearms and ballistics is as limited as your knowledge of politics and history.