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7mm WSM Ammo

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The 7mm Winchester Short Magnum (also known as the 7mm WSM) is a centerfire cartridge developed in partnership with Browning Arms Company and Winchester ammunition, making its debut and introduced to the shooting public in 2001.

The 7mm WSM cartridge achieves its useful purpose as an excellent cartridge for more abundant mule deer, sheep, black bear, and elk. The 7mm Winchester Short Magnum's popularity often comes from the fact that it can be chambered in shorter, lightweight hunting rifles.

The 7mm WSM Ammo is similar to the .300 WSM with the case necked down to handle .284" bullets. However, the distance from the case head to the datum line on the shoulder is longer for the 7WSM, preventing accidental chambering or firing of the .284" 7mm bullet in .270 WSM's .277" bore.

About: 7mm WSM

  • Type: Rifle
  • Place of origin: United States
  • Designer: Winchester
  • Designed: 2001


  • Parent case: .300 Winchester Short Magnum
  • Case type: rebated rim, bottleneck
  • Bullet diameter: 0.284 in (7.2 mm)
  • Neck diameter: 0.321 in (8.2 mm)
  • Shoulder diameter: 0.538 in (13.7 mm)
  • Base diameter: 0.555 in (14.1 mm)
  • Rim diameter: 0.535 in (13.6 mm)
  • Case length: 2.100 in (53.3 mm)
  • Rifling twist: 1 turn in 9.5"
  • Primer type: large rifle magnum

Ballistic performance

Bullet mass/type Velocity Energy
160 gr (10 g) 3,050 ft/s (930 m/s) 3,304 ft⋅lbf (4,480 J)

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