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H4831-SC is almost ideal for 300WM. VV-N560 is good too, but the Hodgdon powder will be more temp-stable.
Also look at the 210gr Berger VLD bullet. It has a much higher B.C. than the 190SMK (0.64 vs. 0.53 for the SMK). You'll sacrifice a little muzzle velocity, but will get a lot less wind drift.
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