Hornady doesn't publish load data for their 285gn for the .338 Win Mag. Probably because it isn't terribly well suited for it. To seat it to mag length, which I think you could do, you'd end up with so much bullet in the case that powder capacity would seriously suffer and so would velocity. The velocity loss would probably more than offset the increase in BC compared to the 250gn pill. I've got a feeling that is going to be the case with any bullet heavier than the 250. With a .670 BC, the 250gn HPBT isn't exactly a slouch.
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