The .400 Taylor Magnum is a rifle cartridge. It was derived from "a modified .505 Gibbs, necked down to 0.375 inches".[1] The .408 Cheyenne Tactical and the .375 Cheyenne Tactical were later based on the .400 Taylor Magnum.[1][2]
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The original article can be found at .400 Taylor Magnum and the edit history here.