I'm considering getting a .270 WSM in either the Kimber Montana or the Classic.

Can anyone tell me if there's any noticable difference in the recoil between the .270 Win and the .270 WSM in these rigs?
How about muzzle blast. Any difference there?
My biggest reason for considering the .270 WSM is the shorter action, overall length, and slightly lighter than the .270 Win.

I have a 84M in .260 that I absolutely love, but my wife has claimed it now! (Plus it's a good excuse for another rifle!)

Thanks in advance...