300 WSM powder choices

[Jpron]

I know it's not on your list, but mine loves staball 6.5. And I can find it pretty easily these days. Just in case the ones you listed don't work out

 

[Muddyboots]

My stubborn 300WSM shot really good with 180AB with Hybrid100V with good velocity. It shows up as most accurate powder on Nosler load data. Prob FIRST time I ever agreed with their data. Granted not a Berger but the bullet weight may be worth trying.