7mm Shooting Times Westerner
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| 7mm Shooting Times Westerner | ||||||||||||||||||||||||
|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|
 From left: .308 Winchester, 7mm Remington Magnum, 7mm Shooting Times Westerner | ||||||||||||||||||||||||
| 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]
Background
[edit]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]
See also
[edit]- 7mm caliber for other cartridges of this caliber.
- Table of handgun and rifle cartridges
References
[edit]- ^ Max chamber pressure - saami specs. Return to the index to LASC. (n.d.). Retrieved May 1, 2023, from http://www.lasc.us/SAAMIMaxPressure.htm
- ^ "7 mm STW data" from Accurate Powder
- ^ "7mm STW". www.chuckhawks.com.
- ^ "7mm Shooting Times Westerner". www.ballisticstudies.com.
- ^ Association, National Rifle. "An Official Journal Of The NRA | An Ode to the 7mm STW". An Official Journal Of The NRA.
- ^ Hawks, Chuck. "The 7mm STW". chuckhawks.com. Retrieved 30 August 2024. (subscription required)
- ^ Simpson, Layne (January 4, 2011). "The 7mm STW Story". RifleShooter.
- ^ Simpson, Layne (2019-01-28). "The 7mm STW - Still Holding Its Own". Shooting Times. Retrieved 2024-08-28.