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7mm Shooting Times Westerner | ||||||||||||||||||||||||
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Type | Rifle | |||||||||||||||||||||||
Place of origin | United States | |||||||||||||||||||||||
Production history | ||||||||||||||||||||||||
Designer | Layne Simpson | |||||||||||||||||||||||
Designed | 1979 | |||||||||||||||||||||||
Produced | 1989-Present | |||||||||||||||||||||||
Specifications | ||||||||||||||||||||||||
Parent case | 8mm Remington Magnum | |||||||||||||||||||||||
Case type | Belted, bottleneck | |||||||||||||||||||||||
Bullet diameter | .284 in (7.2 mm) | |||||||||||||||||||||||
Neck diameter | .315 in (8.0 mm) | |||||||||||||||||||||||
Shoulder diameter | .4868 in (12.36 mm) | |||||||||||||||||||||||
Base diameter | .5126 in (13.02 mm) | |||||||||||||||||||||||
Rim diameter | .532 in (13.5 mm) | |||||||||||||||||||||||
Rim thickness | .220 in (5.6 mm) | |||||||||||||||||||||||
Case length | 2.850 in (72.4 mm) | |||||||||||||||||||||||
Overall length | 3.60 in (91 mm) | |||||||||||||||||||||||
Case capacity | 93.3 gr of H2O | |||||||||||||||||||||||
Rifling twist | 1 in 9 in (229 mm) | |||||||||||||||||||||||
Primer type | Large rifle magnum | |||||||||||||||||||||||
Maximum pressure ( SAAMI [1]) | 65,000 psi (450 MPa) | |||||||||||||||||||||||
Ballistic performance | ||||||||||||||||||||||||
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Test barrel length: 26" Source(s): Accurate Powder [2] |
The 7mm Shooting Times Westerner, sometimes referred to as the 7mm STW, began as a wildcat rifle cartridge developed by Layne Simpson, Field Editor of Shooting Times, in 1979. [3] It is an 8mm Remington Magnum case that has been "necked down" (narrowing the case opening) by 1 mm to accept 7 mm (.284 in) bullets. [4]
The first major company to produce the 7mm STW was A-Square in 1994. [5] The 7mm STW graduated to commercial status when it was officially recognized by SAAMI in 1996., [6] and the Remington Arms Company started to produce it in 1997, [7] with other ammunition manufacturers following. As of 2019, Federal Premium Ammunition is the only major manufacturer to still offer it on a regular basis, but smaller manufacturers also provide loaded ammunition. [8]