All of them are big bangers.. I have the standard .338 WM and have shot aRUM a few times..to be honest they are about as much as I can take of the bench for about 5 shots and I"m done. All of the cartridges you mentioned are almost the ultimate in long range sniping and hunting. I've read a lot about the Sierra 300 grain match king as being a great bullet in all of the ones you mentioned. Can't beat that big bullet when you need penetration and killing power at the edge of what we want to shoot em'...however they are not for the faint of heart.
I shoot a 300 Tomahawk made by the late Ray Romain.It is a 300 RUM with the shoulder blown out.It has a muzzle brake on it and you could shoot it all day as long as you have good hearing protection. They are LOUD!!!