Googled 300WSM model SXR and found some pictures on Cabela's website.
If they took the "sXr" logo off of the receiver and all I was looking at was just the receiver, I'd swear I was looking at the same receiver as my Remington Model 740. Okay, the 740 I have was made the year I was born and that was a couple of days ago, but the action, charging handle, safety, etc. all look virtually identical. My 740 is in .244/6mmRemington and not nearly as powerful as the .300WSM, but it's still a very sweet shooting rifle. I've put several deer in the freezer using mine, so you're going to have to tell us how yours shoots.