I've got some sitting here that I loaded for the last .300 'Bee and they seem to shoot in this one as well. 180 A-Frame, 87 grains of H1000 in new Norma brass, 215 primer and 3150 FPS. In a general sort of way that s 2 grains over Hodgdons for that bullet weight and 2 grains under Nosler's data. Plenty warm though.
More commonly I use 83 grains of 7828. That's not max in some books but it sure is in my gun. Also right around 3150. My current 300 Weatherby has a 24" barrel.