475 A&M Magnum

Historical Notes:

This monster was developed by the Atkinson & Marquart Rifle Co. of Prescott, Arizona, in 1958-59. It is based on the 378 Weatherby Magnum case and necked up to 475 caliber. Bullets of this diameter are made by Barnes. Only a few custom made rifles have been turned out in this caliber.

General Comments:

The 475 A&M Magnum can develop nearly 10,000 foot pounds of muzzle energy, which makes it one of the  most powerful sporting cartridge ever developed. However, it is not available on a commercial basis and is neither widely used nor know. Until the advent of the 470 Nitro Express, the 460 Weatherby Magnum held the title as the most powerful commercial cartridge available. No doubt some wildcatter could develop a more powerful round, particularly if it were based on the 50 BMG cartridge. However, there is really no need for cartridges of this power for hunting anything on this planet. Rifles in this class have little practical value for North American hunting conditions. Recoil is around 90 foot pounds!

Source: Cartridges of the World

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