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| 7 mm STW Type Rifle Place of origin USA colspan="3" style="background: lightsteelblue; text-align: center; vertical-align: middle;"
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| Production history Designer Layne Simpson Designed 1979 Produced 1989-Present colspan="3" style="background: lightsteelblue; text-align: center; vertical-align: middle;"
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| Specifications Parent case 8 mm Remington Magnum Case type Belted, bottleneck Bullet diameter .284 in (Expression error: Unexpected < operator.
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 mm
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Neck diameter .315 in (Expression error: Unexpected < operator.
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 mm
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Shoulder diameter .4868 in (Expression error: Unexpected < operator.
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 mm
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Base diameter .5126 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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Rim thickness .220 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 3.60 in (Expression error: Unexpected < operator.
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 mm
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Rifling twist 9 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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Test barrel length: 26"
Source: Accurate Powder [1]

The 7 mm STW (Shooting Times Westerner) began as a wildcat rifle cartridge developed by Layne Simpson in 1979.[2] It is an 8 mm Remington Magnum case that has been "necked down" (narrowing the case opening) by 1 mm to accept 7 mm (.284 in) bullets. This cartridge is named after the magazine Shooting Times where Layne Simpson is a regular contributor.

BackgroundEdit

The 7mm STW graduated to commercial status when it was officially recognized by SAAMI in 1996.[3] Remington Arms Company was one of the first large ammunition companies to produce this cartridge in 1997, with others like Federal Cartridge Company, A-Square, and Speer also carrying it. All mass-market US riflemakers now offer a selection of production models chambered for the 7mm STW, which has established a reputation as a fine long-range deer and medium game rifle.

PerformanceEdit

The only the commercial 7mm cartridge to have more power than the 7mm STW is the 7mm Remington Ultra Magnum.[3] Dimensionally and ballistically, there are similarities between the 7mm STW and the 6mm cartridge based on the .375 H&H Magnum case necked down, known as the .244 H&H Magnum.

CategoriesEdit

Cartridge:rifles
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