I take a venture here and say I don't think you can get enough H1000 in a 300 Win Case to be over pressure... someone with Quick Load may be able to debunck that or prove it is so...

but all I know, is that I have had no pressure issues since using H1000 in my pair of 300 Winchesters, which working up are easily giving Muzzle Velocity well into 300 Weatherby territory...

with 165 grainers right up to my favorite, 220 grainers running right at 2950 or a little more... but not exceeding 3000 fps...