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.300 Remington Ultra Magnum | ||||||||||||||||||||||||
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![]() .300 RUM cartridge | ||||||||||||||||||||||||
Type | Rifle | |||||||||||||||||||||||
Place of origin | Canada | |||||||||||||||||||||||
Production history | ||||||||||||||||||||||||
Designer | Remington | |||||||||||||||||||||||
Designed | 1999 | |||||||||||||||||||||||
Manufacturer | Remington Arms Company | |||||||||||||||||||||||
Produced | 1999–present | |||||||||||||||||||||||
Specifications | ||||||||||||||||||||||||
Parent case | .404 Jeffery | |||||||||||||||||||||||
Case type | cartridge, center fire primer, bottleneck | |||||||||||||||||||||||
Bullet diameter | .308 in (7.8 mm) | |||||||||||||||||||||||
Neck diameter | .344 in (8.7 mm) | |||||||||||||||||||||||
Shoulder diameter | .525 in (13.3 mm) | |||||||||||||||||||||||
Base diameter | .550 in (14.0 mm) | |||||||||||||||||||||||
Rim diameter | .534 in (13.6 mm) | |||||||||||||||||||||||
Case length | 2.850 in (72.4 mm) | |||||||||||||||||||||||
Overall length | 3.600 in (91.4 mm) | |||||||||||||||||||||||
Case capacity | 110.2 gr H2O (7.14 cm3) | |||||||||||||||||||||||
Rifling twist | 1–10" | |||||||||||||||||||||||
Primer type | Large rifle magnum | |||||||||||||||||||||||
Maximum pressure | 65,000 psi (450 MPa) | |||||||||||||||||||||||
Ballistic performance | ||||||||||||||||||||||||
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Test barrel length: 24" (610 mm) Source(s): Accurate Powder[1] |
The .300 Remington Ultra Magnum, also known as the .300 Ultra Mag, 7.62×72mm or .300 RUM, is a 7.62 mm (.308 inch) 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 only to the .30-378 Weatherby Magnum in cartridge-case capacity.
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