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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.
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.
.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.
.223 Remington – Original AR-15 cartridge: .223 cartridges may function in a 5.56×45mm rifle, however 5.56×45mm cartridges may produce excessive pressure in a .223 Rem rifle. On the other hand, a .223 Wylde chamber is used on .223 Rem rifle barrels to allow them to safely fire either .223 Remington or 5.56×45mm NATO ammunition. [6]
338 Edge (.338/300 Ultra Mag, .338 Ultra Cat) is a Wildcat rifle cartridge based on the .300 Remington Ultra Magnum round necked up to accept 0.338" diameter bullets. [1] It is gaining popularity as a long-range cartridge due to the wide availability of 0.338" projectiles that have a high ballistic coefficient.
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 ...
Compared to the 7mm Remington Magnum, top 7mm RUM loads deliver 25% more energy at 300 yards. [citation needed] Such performance demands a price and in this case, that is a large muzzle blast, sharp recoil and short barrel life. [1] The 7mm Ultra Magnum boasts the largest case of any commercial 7mm cartridge.
It is a beltless, rebated rim cartridge created by necking up the .300 Remington Ultra Magnum case to .375 caliber with no other changes. [1] Factory loadings are less powerful than handloads for the cartridge. Remington factory loads produce 2,760 ft/s (840 m/s) [3] with a 300 grain (19 g) bullet for 5,070 ft·lbf (6.88 kJ) of muzzle energy.