That's about it as for the question.

I've been wondering (after a rechamber) if the 338 RCM rifle would work with the WSM case.
This is, that I could run the 338 WSM instead of the 338 RCM. I know that the chamber will clean up, but I don't know if the rifle will feed the WSM based cartridge.

Anybody know the answer.?

Thanks

get a couple or three dummy rounds and try it

I don't hace access to either right now, I'm out of state.