I've had at least six (maybe seven) 300 WSM's. I've taken antelope, deer and a number of elk with it. Great round, and it and the 308 WIn have been the easiest rounds I've ever worked with to get excellent accuracy with. I like SA rounds. With RL 17 I could get excellent accuracy and 3,035 fps with 180's. That's definitely "magnum" territory. And Scott makes excellent points about Lapua brass and the trend to suppressors. An 18" 300 WSM with a Suppressor is a LOT of power...

“Perfection is Achieved Not When There Is Nothing More to Add, But When There Is Nothing Left to Take Away” Antoine de Saint-Exupery