RE: .270 Win & .270 WSM what is the difference??
WSM = Winchester Short Magnum.
It's a shorter fatter case than a standard .270 Win. The WSM is a bit more potent. A couple hundred feet per second more than the standard. Seems to me that if you're hunting deer, and your range is going to be 300 yards or less, you may be better off with the milder recoil of the .270 Win.