Powder Selection for 300WM with a 22" Barrel

[turbobrick]

H4350 is also at the top of my list along with H4831SC. I was considering RL16 as well, but it's not nearly as temp stable as the other two.

I'm not sure what criteria you're using, but RL16 is considered to be one of the most temp stable powders out there.

 

[35WhelenAI]

OP, with the new barrel it's an entirely new/different chamber, barrel rifling/dimensions, you shouldn't be surprised you got over pressure. That is an entirely new system you are working with. By the same token if velocity had fallen off dramatically, taking in consideration the shorter barrel, you shouldn't be surprised either. It goes both ways. I'm shocked no one has mentioned that and everyone went right into talking load data.