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| .300 Remington Short Action Ultra Magnum Type Rifle Place of origin USA colspan="3" style="background: lightsteelblue; text-align: center; vertical-align: middle;"
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| Production history Designer Remington Manufacturer Remington Produced 2001 colspan="3" style="background: lightsteelblue; text-align: center; vertical-align: middle;"
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| Specifications Parent case .300 Remington Ultra Magnum Bullet diameter .308 in (Expression error: Unexpected < operator.
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 mm
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Neck diameter .344 in (Expression error: Unexpected < operator.
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 mm
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Shoulder diameter .534 in (Expression error: Unexpected < operator.
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Base diameter .550 in (Expression error: Unexpected < operator.
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Rim diameter .534 in (Expression error: Unexpected < operator.
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Case length 2.015 in (Expression error: Unexpected < operator.
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Overall length 2.825 in (Expression error: Unexpected < operator.
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Rifling twist 1-10" Primer type Large rifle magnum colspan="3" style="background: lightsteelblue; text-align: center; vertical-align: middle;"
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| Ballistic performance Bullet weight/type Velocity Energy style="vertical-align:middle; border-bottom: 1px dotted #aaa;
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" | 150 gr (Expression error: Unexpected < operator.
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" | 165 gr (Expression error: Unexpected < operator.
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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]

PerformanceEdit

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.

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

ComparisonsEdit

  • 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.

.300 RSAUM performance comparisons [2]
Cartridge Bullet Weight Muzzle velocity Muzzle energy
.300 RSAUM 200 2790 3458
.300 WSM 200 2822 3538
.300 Win Mag 200 2877 3677
.300 Wby Mag 200 2987 3963
.300 RUM 200 3154 4419

CategoriesEdit

Cartridge:rifles
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