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.22 Win Auto Ammunition

Also known as: .22 Winchester Automatic, .22 WRA

The .22 Winchester Automatic is a rimfire rifle cartridge introduced to go with the 1903 Semiautomatic rifle. It will not chamber correctly in any other .22 rimfire or work with other .22 ammunitions. Winchester designed it as an exclusive round for the M1903 to avoid gun owners from using black powder rounds, which were still common when the .22 Win Auto was introduced.

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