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.300 Remington Short Action Ultra Magnum (also known as 300 RSAUM, 300 RSUM or 300 Rem SAUM) is a .30 caliber short magnum cartridge that is a shortened version of the Remington 300 Ultra Mag, both of which derive from the .404 Jeffery case.
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.
The .30 Remington / 7.8x52mm cartridge was created in 1906 by Remington Arms. It was Remington's rimless answer to the popular .30-30 Winchester cartridge . Factory ammunition was produced until the late 1980s, but now it is a prospect for handloaders.
In pump action firearms, a sliding grip at the fore-end beneath the barrel is manually operated by the user to eject and chamber cartridges. Pump actions are predominantly found in shotguns . Some examples of firearms using the pump-action are the Winchester Model 1912 , Remington 870 , and Mossberg 500 .
The Automag III was principally chambered for the .30 Carbine cartridge, which was originally designed for the World War II-era M1 Carbine. It was also one of the few pistols available in the 9mm Winchester Magnum cartridge, but only the original AMT production pistols were made in this chambering, however; later Galena production was limited ...
The .30-378 Weatherby Magnum is a .30 caliber, belted, bottle-necked rifle cartridge. [2] The cartridge was developed in response to a US Army military contract in 1959. While still unreleased to the public, the cartridge went on to set world records for accuracy including the first ten 10X in 1,000 yards (910 m) benchrest shooting. [ 3 ]
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The principle at work in the short magnum cartridge is the fitting of larger volumes of powder in closer proximity to the primer's flash hole, resulting in more-uniform ignition. .300 WSM has a case capacity of 80 grains. The .30-06 Springfield holds 69 grains; .308 Winchester holds 56 grains; 30-30 Winchester holds 45 grains.
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