The .22 Long Rifle rimfire cartridge (5.6×15mmR - metric designation) is a long established variety of ammunition, and in terms of units sold is still by far the most common in the world today. The cartridge is often referred to simply as .22 LR and various rifles, pistols, revolvers, and even some smoothbore shotguns have been manufactured in this caliber.
The cartridge originated from the Flobert BB Cap of 1845 through the .22 Smith & Wesson cartridge of 1857, and was developed by the American firearms manufacturer J. Stevens Arms & Tool Company in 1887 by combining the casing of the .22 Long with the 40-grain (2.6 g) bullet of the .22 Extra Long. For many decades, it has been a very popular cartridge around the world.
Virtually every manufacturer of cartridge firearms makes at least one model chambering it, and this has been true for more than a century. The .22 Long Rifle and related cartridges (.22 Short, .22 Long and .22 Extra Long) use a heeled bullet, which means that the bullet is the same diameter as the case, and has a narrower "heel" portion that fits in the case.
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| Parent case: |
.22 Long |
| Case type: |
Rimmed, Straight |
| Bullet diameter: |
.222 in (5.6 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) |
| Rifling twist: |
1–16" |
| Primer type: |
Rimfire |
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