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22 Win Auto Ammo

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The .22 Winchester Automatic (also known as the .22 Winchester Auto and occasionally .22 Win Auto) is a .22in (5.6mm) American rimfire rifle cartridge.

22 Winchester automatically matches the performance of a standard 22 Long rifle cartridge.

.22 Win Auto was never used in any other firearm. It will not chamber correctly in other .22 rimfire weapons, nor will other .22 rimfire ammunition, including the very dimensionally-similar .22 Remington Automatic, interchange with it.

The two advantages of the 22 Win Auto was the fact it could push a slightly heavier round at the same velocity your standard 22 could. 

The second was the fact it was a semi-automatic rifle that offered a rapid method of follow up shots for small game hunting.

About: .22 Win Auto

  • Type: Rifle
  • Place of origin: United States
  • Produced: 1903–1932


  • Bullet diameter: .222 in (56 mm)
  • Neck diameter: .250 in (6.4mm)
  • Base diameter: .250 in (6.4mm)
  • Rim diameter: .310 in (7.9mm)
  • Case length: .665 in (16.9mm)
  • Overall length: .915 in (23.2mm)
  • Primer type: rimfire

Ballistic performance

Bullet mass/type Velocity Energy
45gr (3g) 1,055ft/s (322m/s) 111ft⋅lbf (150J)
45gr (3g) 882ft/s (269m/s) 78ft⋅lbf (106J)

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