RE: 300 Ultra mag ...can these tables be right?
Definately. With that extra pound on that Weatherby, it should be even lower than the 300RUM. Now if that 300RUM wieghed 12 lbs, then I can see it. Maybe!! From accurate reloading page, here is what they got.
300 WBY 9lb 150gr 14.3velocity 28.7ft lbs
300 WBY 9lb 220gr 15.7velocity 34.3ft lbs