.300 RUM Ammo
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The .300 Remington Ultra Magnum, also known as the .300 Ultra Mag or .300 RUM is a 7.62 mm caliber rifle cartridge, 7.62×72mm, or .300 caliber rifle cartridge introduced by Remington Arms in 1999.
The .300 Remington Ultra Magnum is one of the largest commercially available .300 caliber magnums currently being produced. It is a beltless, rebated rim cartridge, capable of handling all massive North American game, as well as long-range shooting. Among commercially produced .30-caliber rifle chamberings, the .300 Remington Ultra Magnum is second only to the .30-378 Weatherby Magnum in cartridge-case capacity.
The .300 Remington Ultra Magnum is a member of the Remington Ultra Magnum cartridge family based on the .404 Jeffery via the Canadian Magnum cartridges.