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The .22 ILARCO / 5.7x24mmRF, also known as the .22 Winchester Short Magnum Rimfire or .22 American, [2] [3] was a rimfire cartridge designed in 1987 for the American-180 rimfire submachine gun. At the time the cartridge was created, the design of the American-180 had been taken over by the Illinois Arms Company, Inc., hence the ILARCO name.
The .22 long rifle, also known as the .22 LR or 5.7×15mmR, [4] [5] is a long-established variety of .22 caliber rimfire ammunition originating from the United States. It is used in a wide range of firearms including rifles , pistols , revolvers , and submachine guns .
The most common rimfire cartridges are chambered for .17 caliber and .22 caliber. The bullet diameter for .17 caliber firearms generally measure .172 inch (4.37 mm), while the bullet diameter for .22 caliber firearms generally measure .222 inch (5.64 mm).
Using the same 40 gr (2.6 g) outside-lubricated bullet later adapted for the much more common .22 long rifle, [2] the extra long was loaded with 6 gr (389 mg) of black powder. [2] Originally, it slightly outperformed the .22 LR, but was "not noted for great accuracy", [2] while later smokeless loads achieved about the same muzzle velocity as ...
The Aguila SubSonic Sniper round uses a .22 short case with a 60-grain (3.9 g) bullet (twice the weight of the .22 short bullet and 50% heavier than a .22 long rifle bullet) giving an overall length of a .22 long rifle round, making categorizing the SSS problematic: while the SSS case size is .22 short, the firing chamber of the barrel must be ...
.22 caliber, or 5.6 mm, refers to a common firearms bore diameter of 0.22 inch (5.6 mm) in both rimfire and centerfire cartridges. Cartridges in this caliber include the very widely used .22 Long Rifle and .223 Remington/5.56×45mm NATO. .22 inch is also a popular air gun pellet caliber, second only to the ubiquitous .177 caliber.
The American-180 is a submachine gun developed in the 1960s which fires the .22 Long Rifle or .22 ILARCO cartridges from a pan magazine. The concept began with the Casull Model 290 that used a flat pan magazine similar to designs widely used prior to World War II. Only 87 Casull M290s were built, as the weapon was expensive to manufacture. [5]
Introduced in the Winchester M1890 slide rifle, it had a flat-nose slug, and is identical to the .22 Remington Special (which differed only in having a roundnosed slug). [3] It uses a flat-based, inside-lubricated bullet, which differs from the outside-lube heeled bullet of the .22 BB, .22 CB, .22 Short, .22 Long, .22 Long Rifle, and .22 Extra Long cartridges.