Anyone have a favorite powder for the 300 Win mag and 200 gr Sierra Game Kings?

Thanks,
Scott

Both IMR and H 4831 are very good but I obtained very good accuracy and the highest velocity with RL22.

I would try RL 22, RL 25, or IMR 7828. The slower powders will probably work best with heavy bullets. Overall I think RL 22 is my favorite powder for the 300 Win.

My original preferred load was:
Bullet: Sierra 200 Grain Hollow Point Boat Tail
Powder: 71.7 grains of IMR-4831
Primer: Winchester WLR
Case: Winchester
Firearm: Ruger 77
Velocity: 2986 FPS @ 15' from muzzle
Accuracy: 5-shot groups at 200 yards, <1.0"

In later testing I found that RL-25 from 69.8 grains to 78.0 grains showed promise. However, since I had around 500 of the "old loads", I never really did a thorough work-up.