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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.
.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 long case is very large and provides performance that exceeds existing commercial magnums, such as the .300 Winchester Magnum and .300 Weatherby Magnum. [2] The short design is the same idea as used in the Winchester Short Magnum cartridges. The shorter cartridges are known as Remington Short Action Ultra Magnum, RSAUM, RSUM, or SAUM.
The 300 WSM is a Delta L problem cartridge, meaning it can present unexpected chambering and/or feeding problems. The Delta L problem article explains this problem in more detail. The .300 Remington Short Action Ultra Magnum has very similar cartridge dimensions but is not interchangeable.
.30 Remington AR.30 TC.30-01.30-03 Springfield.30-06 JDJ.30-06 Springfield.303-06.30-30 Winchester.30-378 Weatherby Magnum.30-40 Krag.300 Precision Rifle Cartridge.300-221.300 AAC Blackout.300 H&H Magnum.300 Blaser Magnum.300 ICL Grizzly.300 Lapua Magnum.300 Norma Magnum.300 Remington Short Action Ultra Magnum.300 Remington Ultra Magnum.300 Rook
The .300 AAC Blackout (designated as the 300 BLK by the SAAMI [1] and 300 AAC Blackout by the C.I.P. [2]), also known as 7.62×35 mm, is an intermediate cartridge developed in the United States by Advanced Armament Corporation (AAC) for use in the M4 carbine.
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The .300 Win Mag remains the most popular .30 caliber magnum with American hunters, despite not being as fast as more powerful .300 Magnums such as the .300 Weatherby Magnum and .30-378 Weatherby Magnum as well as the newer .300 Remington Ultra Magnum, .300 Norma Magnum, .30 Nosler, and .300 PRC, though all of these must be chambered in a long ...