.300 Remington Short Action Ultra Magnum (also known as 300 RSAUM, 300 RSUM or 300 Rem SAUM) is a .30
caliber
In guns, particularly firearms, but not #As a measurement of length, artillery, where a different definition may apply, caliber (or calibre; sometimes abbreviated as "cal") is the specified nominal internal diameter of the gun barrel Gauge ( ...
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
3 (three) is a number, numeral and digit. It is the natural number following 2 and preceding 4, and is the smallest odd prime number and the only prime preceding a square number. It has religious and cultural significance in many societies ...
round in 2001, resulting in the Winchester product getting the marketing advantage that has eclipsed the Remington offering.
[The .300 Remington Short Action Ultra Mag by Chuck Hawks](_blank)
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Performance
The 300 RSAUM's ballistics are similar to 300 Win Mag and 300 WSM
3 (three) is a number, numeral and digit. It is the natural number following 2 and preceding 4, and is the smallest odd prime number and the only prime preceding a square number. It has religious and cultural significance in many societies ...
. 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.
Muzzle velocity
* 10.69 g (165 gr) full metal jacket (FMJ): 3,075 ft/s
* 11.66 g (180 gr) FMJ: 2,960 ft/s
Comparisons
* The WSM has slightly more case capacity and thus, slightly more velocity
* The WSM is more popular and more ammo and handloading
Handloading, or reloading, is the practice of making firearm cartridges by manually assembling the individual components ( metallic/ polymer case, primer, propellant and projectile), rather than purchasing mass-assembled, factory-loaded com ...
data are available
See also
* .300 Remington Ultra Magnum
* 7 mm caliber
This is a list of firearm cartridges which have bullets in the caliber
In guns, particularly firearms, but not #As a measurement of length, artillery, where a different definition may apply, caliber (or calibre; sometimes abbreviated a ...
* List of firearms
This is an extensive list of small arms—including pistols, revolvers, submachine guns, shotguns, battle rifles, assault rifles, sniper rifles, machine guns, personal defense weapons, carbines, designated marksman rifles, multiple-barrel firearms ...
* List of rifle cartridges
List of rifle cartridges, by primer type, Caliber, calibre and name.
File:Cartridge Sample 2.jpg, 350px, From left to right: 1 .17 Hornady Mach 2, 2 .17 Hornady Magnum Rimfire, 3 .22 Long Rifle, 4 .22 Winchester Magnum Rimfire, 5 .17/23 SMc, 6 5mm ...
* Table of handgun and rifle cartridges
This is a table of selected pistol/submachine gun and rifle/machine gun cartridges by common name. Data values are the highest found for the cartridge, and might not occur in the same load (e.g. the highest muzzle energy might not be in the same ...
* List of individual weapons of the U.S. Armed Forces
References
7mm-300 SAUM Cartridge Guide by AccurateShooter.com
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Pistol and rifle cartridges
Remington Short Action Ultra Magnum rifle cartridges