My experience with RL17 is that Allian's 300 WSM data is INSANE.

With multiple 300 WSM's I couldn't get close to the listed loads or velocities without pressure signs.

I've also heard that RL17 is not in fact a "new" powder but is a slightly reformed Swiss powder originally developed for the 7.5mm Swiss... can't confirm it though.

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