.300 Remington SA Ultra Mag

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.300 Remington Short Action Ultra Magnum
Type	Rifle
Place of origin	USA
Production history
Designer	Remington
Manufacturer	Remington
Produced	2001
Specifications
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)
Rifling twist	1-10"
Primer type	Large rifle magnum
Ballistic performance
Bullet weight/type	Velocity	Energy
150 gr (9.7 g) SP	3,253 ft/s (992 m/s)	3,525 ft·lbf (4,779 J)
165 gr (10.7 g) SPBT	3,126 ft/s (953 m/s)	3,581 ft·lbf (4,855 J)
180 gr (12 g) HPBT	2,954 ft/s (900 m/s)	3,489 ft·lbf (4,730 J)
200 gr (13 g) SP	2,790 ft/s (850 m/s)	3,458 ft·lbf (4,688 J)
Test barrel length: 24" Source: 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]

1 Performance
- 1.1 Muzzle velocity
2 Comparisons
3 See also
4 References

[edit] Performance

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

[edit] Muzzle velocity

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

[edit] Comparisons

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

On the other hand, the RSAUM would appear to be a more volume efficient cartridge. It has 7.5% less case volume, yet it looks to have nearly the same ballistics. However, this may simply be due to the core-lokt projectile in Remington's factory loads.