.300 Holland and Holland

The .300 Remington Ultra Magnum, also known as the .300 Ultra Mag’ or .300 RUM is a 7.62 mm (.308in.) caliber rifle cartridge, 7.62×72mm, or .30 caliber rifle cartridge introduced by Remington Arms in 1999. The .300 Remington Ultra Magnum is one of the largest commercially available .30 caliber magnums currently being produced. It is a beltless, rebated rim cartridge, capable of handling all large North American game, as well as long-range shooting. Among commercially produced .30-caliber rifle chamberings, the .300 Remington Ultra Magnum is second to the .30-378 Weatherby Magnum in cartridge-case capacity.

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