.300 Remington Short Action Ultra Magnum
Type Rifle
Place of origin USA
Production history
Designer Remington
Manufacturer Remington
Produced 2001
Parent case .300 Remington Ultra Magnum
Bullet diameter .308 in (Bad rounding hereScript error mm)
Neck diameter .344 in (Bad rounding hereScript error mm)
Shoulder diameter .534 in (Bad rounding hereScript error mm)
Base diameter .550 in (Bad rounding hereScript error mm)
Rim diameter .534 in (Bad rounding hereScript error mm)
Case length 2.015 in (Bad rounding hereScript error mm)
Overall length 2.825 in (Bad rounding hereScript error mm)
Rifling twist 1-10"
Primer type Large rifle magnum
Ballistic performance
Bullet weight/type Velocity Energy
150 gr (Bad rounding hereScript error g) SP3,253 ft/s (Bad rounding hereScript error m/s)3,525 ft·lbf (Bad rounding hereScript error J)
165 gr (Bad rounding hereScript error g) SPBT3,126 ft/s (Bad rounding hereScript error m/s)3,581 ft·lbf (Bad rounding hereScript error J)
180 gr (Bad rounding hereScript error g) HPBT2,954 ft/s (Bad rounding hereScript error m/s)3,489 ft·lbf (Bad rounding hereScript error J)
200 gr (Bad rounding hereScript error g) SP2,790 ft/s (Bad rounding hereScript error m/s)3,458 ft·lbf (Bad rounding hereScript error J)
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 was put on the market shortly after Winchester released its 300 WSM round in 2001.[1]


The 300 RSAUM's ballistics are similar to 300 Win Mag and 300 WSM. The difference in ballistics between the WSM and RSAUM are fairly minuscule.

Muzzle velocityEdit

  • 10.69 g (165 gr) Full Metal Jacket(FMJ): 3,075 ft/s
  • 11.66 g (180 gr) Full Metal Jacket(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
.300 RSAUM performance comparisons [2][3]
Cartridge Bullet Weight Muzzle velocity Muzzle energy
.30-06 Springfield 200 2569 2932
.300 RSAUM 200 2790 3458
.300 WSM 200 2822 3538
.300 Win Mag 200 2877 3677
.300 H&H Magnum 200 2913 3769
.300 Wby Mag 200 2987 3963
.300 RUM 200 3154 4419

See alsoEdit


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