The term magnum was first used with the .357 Smith & Wesson Magnum (to use the entire name) to designate a cartridge that had higher energy than the parent catridge it was develoepd from. In the case of the .357, the parent was .38 Special. In the case of the .44 magnum, parent was .44 Special. A magnum is a bottle of champagne that is larger than a standard bottle, and the word was borrowed by the firearms world.
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