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| .338 Remington 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 Designed 2000 colspan="3" style="background: lightsteelblue; text-align: center; vertical-align: middle;"
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| Specifications Parent case .300 Remington Ultra Magnum Case type Beltless, rebated, bottleneck Bullet diameter .338 in (Expression error: Unexpected < operator.
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mm
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Neck diameter .371 in (Expression error: Unexpected < operator.
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mm
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Shoulder diameter .5250 in (Expression error: Unexpected < operator.
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Base diameter .5500 in (Expression error: Unexpected < operator.
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mm
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Rim diameter .532 in (Expression error: Unexpected < operator.
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mm
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Case length 2.850 in (Expression error: Unexpected < operator.
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mm
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Overall length 3.600 in (Expression error: Unexpected < operator.
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Case capacity 113 gr H2O (7.345 cm³) Rifling twist 1-10 in (254 mm) Primer type Large rifle magnum Maximum pressure 65,000 psi (Expression error: Unexpected < operator.
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MPa
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| Ballistic performance Bullet weight/type Velocity Energy style="vertical-align:middle; border-bottom: 1px dotted #aaa;
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" | 250 gr (Expression error: Unexpected < operator.
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Test barrel length: 26"
The .338 Remington Ultra Magnum is a .338 caliber rifle cartridge introduced by Remington Arms in 2002. It is a beltless, rebated rim cartridge created by necking up the .300 Remington Ultra Magnum case to .338 caliber with no other changes. The .338 Remington Ultra Magnum is second only to the .338 Lapua Magnum and .338-378 Weatherby Magnum in cartridge-case capacity.
Handloaders should note that this cartridge already operates at very high pressures (65,000 PSI), significantly higher than standard rifle cartridges and higher even than most "magnums." This cartridge should not be "hot rodded," as many handloaders have done over the years with more conventional, lower pressure rounds.