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I don't have a 300 WM, but I do have a 300Winnie necked down to 7mm and I use H1000 (74g) and Retumbo w/ 7mm 180 Bergers to get to 3050fps. H4831 didn't get me where I was going. I would think you'll have better luck w/ a slower powder than H4831. Good luck.
I run my 300 with 77.3 grs Hybrid 100V, 190 Mk's Rock Creek barrel 11 twist. Very accurate for me. IMR4350 is showing me promise as well as IMR7828SSC.