You've never shot an elk or moose with a 200gr Nosler partition from a 30-06, have you? The 300wsm has no upper hand on the 30-06, when you use a bullet like that. Trust me, it plows through elk like a freight train. I've had elk stop the 180gr partition from a 300WSM, so there's that too..
For your information I've killed quite a few moose with .270's of various makes. I was not trying to make an argument that something of the power of the .300 WSM was actually necessary. I consider the WSM as much overkill on something as small as deer.
Jim
