I can put it this way. 20+ years ago I wildcatted a .350 Rem Mag to 8mm. The .325 WSM is nearly identical. I've used that cartrdige in Africa, Spain, France, and the lower 48.
Put me on the witness stand and I must give the .338 a slight edge in power. Slight, but not enough that any game you connect with will know the difference.
Not really.
