I've had a lot of 1 shot kills with a 300 WSM. However, inside of 400 yds, it's no better than my 30-06. It's just a little flatter shooting on long shots. If you don't reload the WSM, though, it can get EXPENSIVE. Most of what I see online runs more than $3/round.

“In a time of deceit telling the truth is a revolutionary act.”
― George Orwell

It's not over when you lose. It's over when you quit.