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7mm STW Ammo

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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


  • 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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Latest products for 7mm stw

  • Outdoor Limited HSM 7MM STW PSP Ammunition HSM-7STW-28-N 175 Grain 20 Rounds - Free Shipping with Buyer's Club! for $65.99







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