Have had many 300Win Mag's over the years and most of them shot very well with 180gr. Ballistic tips or accubonds with RL22 powder and 215 primers.
my latest is a Sendero that does not shoot the 180's all that great but shoots incredibly well with Berger210gr.VLD's with H1000. you might have to tinker just a bit to find what your rifle likes best.
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btw I have had the best luck with my 300WM's shooting Nosler,Sierra and Berger bullet's for some reason Hornady ,Speer and Barnes have never shot well in mine. besides the two powders I mentioned also try VVN165 and IMR7828.
