7mm STW Ammo
7mm STW Ammo For Sale- Top Ammo Retailers Available
The 7mm Shooting Times Westerner sometimes referred to as the 7mm STW, began as a wildcat rifle cartridge developed by Layne Simpson in 1979. This cartridge is named after the magazine Shooting Times where Layne Simpson is a regular contributor.
The 7mm STW Ammo graduated to commercial status when SAAMI officially recognized it in 1996.
The 7mm STW can be loaded with a variety of different bullets, which adds to the rounds versatility. Bullet weight can range from 120 grain to 175 grain. Velocities will differ between different projectile weights.
About: 7mm STW
- Type: Rifle
- Place of origin: United States
- 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: 9
- Primer type: Large rifle magnum
Ballistic performance
| Bullet mass/type | Velocity | Energy |
|---|---|---|
| 120 gr (8 g) X | 3,384 ft/s (1,031 m/s) | 3,052 ft⋅lbf (4,138 J) |
| 140 gr (9 g) X | 3,268 ft/s (996 m/s) | 3,321 ft⋅lbf (4,503 J) |
| 150 gr (10 g) BT | 3,233 ft/s (985 m/s) | 3,482 ft⋅lbf (4,721 J) |
| 160 gr (10 g) Partition | 3,177 ft/s (968 m/s) | 3,587 ft⋅lbf (4,863 J) |
| 175 gr (11 g) PSPCL | 3,047 ft/s (929 m/s) | 3,609 ft⋅lbf (4,893 J) |
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