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.256 Win Mag

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The .256 Winchester Magnum was a firearms cartridge developed by Winchester and was produced by necking-down a .357 Magnum cartridge to .257 diameter. It was designed for shooting small game and varmints.

Introduced in 1960, Winchester offered ammo and reloading components into the early 1990s. The cartridge was first chambered in the Ruger Hawkeye single-shot pistol.

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About .256 Win Mag

  • Type: Handgun, rifle
  • Place of origin: United States
  • Designer: Ruger, Winchester
  • Designed: 168760&gateid
  • Manufacturer: Winchester
  • Produced: 1961


  • Parent case: .357 S&W Magnum
  • Case type: Rimmed, Bottlenecked
  • Bullet diameter: .257 in (6.5 mm)
  • Neck diameter: .285 in (7.2 mm)
  • Shoulder diameter :.368 in (9.3 mm)
  • Base diameter: .381 in (9.7 mm)
  • Rim diameter: .440 in (11.2 mm)
  • Rim thickness: .060 in (1.5 mm)
  • Case length : 1.281 in (32.5 mm)
  • Overall length: 1.590 in (40.4 mm)
  • Case capacity: 22 gr H2O (1.4 cm3)
  • Rifling twist: 1 in 14 in (360 mm)
  • Primer type: Small pistol
  • Maximum pressure: 50,000 psi (340 MPa)

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