Well, at least I can try to find a node with H4350 til I land on some H4831 or H1000. My 6.5 savage loves the lighter mono Barnes — curious to find out if this 300wm likes them as well or the heavier Berger's. This will be mostly hunting rifle so I'm not too concerned for past 600-700 yards.You may or may not give up a little velocity using H4831 or H4350 in comparison with other powders, but for accuracy in .300 Win. Magnum, these two are hard to beat. They're worth trying and they're not nearly as temperature sensitive as some of the others.