Not a .300 WSM, but a 6.5-284. Shooting 140 gr. Bergers, my accuracy load with Vv N-165 pushed the bullet at 2,950 fps. Over that, it started showed pressure signs and accuracy loss.

With RL-17, I can push it to 3,100 fps, with best accuracy around 3,000 fps. Early pressure signs at 3,100+ with RL-17 were not unlike early pressure signs with Vv 165 at 3,000 fps. That's a pretty good spread.

DF