I've had four 338 WM's and two 375 H&H's... since you already have a 300 WBY, I believe the 338 WM (and 340 WBY) aren't enough of a real step up over the 300 WBY... for a Brown Bear hunt I'd rather have a 375 H&H that's tuned and feeds perectly... you'd be set for the entire world with those two.
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<br>AFP, I chrono'd a friend's 26" bbl'd 340 WBY... 3,020 fps with 250 grain factory ammo... that's scooting along!
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<br>Brad

“Perfection is Achieved Not When There Is Nothing More to Add, But When There Is Nothing Left to Take Away” Antoine de Saint-Exupery