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The .22 Long Rifle or simply .22 LR or 22 (metric designation: 5.6×15mmR) is a long-established variety of .22 caliber rimfire ammunition originating from the United States. It is used in a wide range of rifles, pistols, revolvers, and submachine guns.
|.22 Long Rifle (.22 LR)|
|Place of origin||United States|
|Designer||J. Stevens Arms & Tool Company|
|Parent case||.22 Long|
|Case type||Rimmed, straight|
|Bullet diameter||.223 in (5.7 mm) - .2255 in (5.73 mm)|
|Land diameter||.212 in (5.4 mm)|
|Neck diameter||.226 in (5.7 mm)|
|Base diameter||.226 in (5.7 mm)|
|Rim diameter||.278 in (7.1 mm)|
|Rim thickness||.043 in (1.1 mm)|
|Case length||.613 in (15.6 mm)|
|Overall length||1.000 in (25.4 mm)|
|Maximum pressure||24,000 psi (170 MPa)|
|Test barrel length: 18.5 in (470 mm)|
In terms of units sold, it is by far the most common ammunition in the world today. Common uses include hunting and shooting sports. Ammunition produced in .22 Long Rifle is effective at short ranges, has little recoil, and is cheap to purchase. These qualities make it ideal for plinking and marksmanship training.
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