RL17 sure makes the 300 WSM go... but supposedly that's what its primary formulation was for. I get a solid 50-100 fps (depending) over the "best" 300 WSM powders. RL17 turns the 300 WSM into a 300 WM that uses less powder and kicks less...

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