Re: A pic worth a thousand words:
Perhaps the truth is something they aren't comfortable admitting. Since heavier bullets are generally used on big, tough animals that can sometimes bite, I think they would rather have people use their partition. Could be they don't have faith in their Accubond when high velocity and close range are involved. Yes, the ,300 Wby's and Ultra's are sometimes used on brown bears but they are seldom recommended by guides. I think the .375 H&H would stabilize a 300 gr. Accubond too but they don't offer that one either.
Like you said, maybe Swift can be persuaded. Or what about the Hornady Interbond?
"Fenced yards ain't hole cards and like as not never will be, reason for rhymers and old five and dimers like me."