It's actually a regular Winchester Magnum, not a WSM (Remington Sendero). I wanted to shoot heavy bullets (200gr) and in a factory WSM you have to eat into your case capacity to feed them from the magazine. The WSM is a great round if you either build a custom on a long action, or if you put an after-market extra-long mag box into a stock short action gun then re-barrel with the throat cut appropriately to seat the bullets out. Lacking the cash to do either of the latter options at the time of purchase, I went with the regular WinMag and have had no regrets (though my bull elk at 683 yds may beg to differ).