Moonducks info is accurate and the Magnum designation came from a variety of incedents that were related to giving a name that created the image of a greater amount( in this case a greater a greater amount of power. The name originates ( you laugh about this but it is true) from the French term Magnum from a Magnum of Champagne which was a larger bottle than a whine bottle. Don't that beat all.
Source is from the Histroty of the Gunb /story of John M. Browning discory times channel.
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