Owned a 300wm and my current 7 is a 7-08 so for me it would be 7RM.
I never found the 300 to be all that much more/great than a 30-06 appropriately loaded. Much as others here have said the 7RM isn't much more than the 280 (makes sense right?)
There really isn't a 30 cal bulled that gets me super excited these days and I'm sitting on a couple hundred 162 AM's - I'd end up 7RM if I HAD to have a mag of some sort between what you list.
