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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 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.300 Ruger Compact Magnum.300 Savage.300 Sherwood.300 Weatherby Magnum.300 Whisper.300 Winchester Magnum.300 Winchester Short Magnum
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.
Left to right: .308 Win, .30-06, .300 Weatherby, .300 ICL Grizzly, .300 RUM.300 ICL Grizzly' is based on the .300 H&H Magnum, and indeed the two are so similar that .300 H&H ammunition can safely be fired through a rifle chambered in .300 ICL Grizzly, as can the ammunition of another .300 H&H-based cartridge, the .300 Weatherby Magnum. [25]
When comparing the .300 RUM and the .300 Weatherby Magnum, however, there is a difference in factory loadings. Performance data is often listed on the side of the ammunition box for those who wish to do an in-store comparison. On average, Weatherby factory ammo is loaded to higher chamber pressures than Remington or Winchester magnum rounds.
Firing a .300 Blackout round in a .223 Remington rifle Firing shotgun shell of the correct gauge or bore, but in a chamber length that is too short (for example a 70 mm shell in 65 mm chamber) While the table below lists most unsafe combinations known by SAAMI, the list is not exhaustive of all dangerous combinations due to the large number of ...
The 7mm RUM was created using the .404 Jeffery case [citation needed] which was also used to develop the .375 RUM.300 RUM, and .338 RUM [citation needed]. By necking down the .300 RUM to suit the .284 or 7mm projectile, Remington produced a non-belted case with a head diameter that is somewhat larger than the belt diameter of the original ...