|.300 Remington Short Action Ultra Magnum|
|Place of origin||USA|
|Parent case||.300 Remington Ultra Magnum|
|Bullet diameter||.308 in (7.8 mm)|
|Neck diameter||.344 in (8.7 mm)|
|Shoulder diameter||.534 in (13.6 mm)|
|Base diameter||.550 in (14.0 mm)|
|Rim diameter||.534 in (13.6 mm)|
|Case length||2.015 in (51.2 mm)|
|Overall length||2.825 in (71.8 mm)|
|Primer type||Large rifle magnum|
|Test barrel length: 24"|
Source(s): Reloading data at Accurate Powder
.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 Remington Short Ultra Mag was put on the market shortly after Winchester released its 300 WSM round in 2001, resulting in the Winchester product getting the marketing advantage that has eclipsed the Remington offering.
The 300 RSAUM's ballistics are similar to 300 Win Mag and 300 WSM. The difference in ballistics between the WSM and RSAUM are insignificant in all practical applications. Differences in muzzle velocity and muzzle energy are related to barrel length rather than case dimension.
- 10.69 g (165 gr) full metal jacket (FMJ): 3,075 ft/s
- 11.66 g (180 gr) FMJ: 2,960 ft/s
- The WSM has slightly more case capacity and thus, slightly more velocity
- The WSM is more popular and more ammo and handloading data are available
|Cartridge||Bullet weight||Muzzle velocity||Muzzle energy|
|.300 Win Mag||200||2,877||3,677|
|.300 H&H Magnum||200||2,913||3,769|
|.300 Wby Mag||200||2,987||3,963|
- .300 Remington Ultra Magnum
- 7 mm caliber
- List of firearms
- List of rifle cartridges
- Table of handgun and rifle cartridges
- List of individual weapons of the U.S. Armed Forces
- The .300 Remington Short Action Ultra Mag by Chuck Hawks
- ".308 Caliber reloading data at Accurate Powder". Archived from the original on 2007-08-25. Retrieved 2007-08-06.
- "Accurate Powder reload data table" (PDF). Archived from the original (PDF) on 20 March 2009. Retrieved 2009-02-09.
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