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::.22 Winchester Automatic

::concepts

Rimfire::multiref    Btype::rimfire    Rifle::barnes    Other::length    Caliber::category    Powder::auto'''

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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.

Introduced for the Winchester Model 1903 semiautomatic rifle,<ref name="multiref1">Barnes, p.275, ".22 Winchester Automatic".</ref> the .22 Win Auto was never used in any other firearm. <ref name="multiref1"/> It will not chamber correctly in other .22 rimfire weapons, nor will other .22 rimfire ammunition, including the very dimensionally-similar .22 Remington Automatic,<ref>Barnes, p.275, ".22 Winchester Automatic", & p.283.</ref> interchange with it. <ref name="multiref1"/> This feature was to prevent use of black powder rounds, which were still popular when it first appeared, from being used in the M1903, resulting in powder residue rapidly clogging the action and rendering the weapon inoperable. <ref name="multiref1"/>

The power of the .22 Win Auto is comparable to the .22 Long rimfire, and while it fires a heavier bullet, <ref name="multiref1"/> it offers no performance edge on either the .22 Long or the very much more common .22 Long Rifle.<ref name="multiref1"/>


.22 Winchester Automatic sections
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