www.realguns.com/loads/358378.htm
www.realguns.com/archives/048.htm
Look's like a great Alaskan bear cartridge.
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This is why I sold the .378 Weatherby and kept the .375 H&H.
As for the single shot on big bears. My buddy and I were trailing a bear and all I had was my Ruger #1 (7mm Mag) and he had a little .308 Ruger 77. We were teasing each other as to who could stop the bear if it charged.