2209 is the go to for the 6.5, if you can get hold of some, grab it and buy enough for the next couple of years. Approx 160 loads per 500gm tub. Dont discount Superformance, it is a nice powder to load with, it does perform, and so long as you are aware, dont leave your loaded rounds sitting in the sun its all good.
Another powder to try in the 300WM would be 7828. I use the 178 ELDX and it performs great out to nice long distances if that floats your boat. If you cant find any, then the 175 Targex usually shoot to the same poi with the same load. And the Targex perform well on wet targets. They are way more readily available, being made here in NZ.
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