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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 .
Rimfire ammunition is a type of metallic cartridge whose primer is located within a hollow circumferential rim protruding from the base of its casing. The most common rimfire cartridges are chambered for .17 caliber and .22 caliber .
The .17 PMC/Aguila, also known as the .17 High Standard, is a rimfire cartridge formed by necking down the .22 Long Rifle casing to accept a .172" diameter bullet. This cartridge was developed in 2003 by firearms maker High Standard and ammunition maker Aguila and introduced in 2004.
The .17 HM2 (Hornady Mach 2) is based on the .22 Long Rifle and offers similar performance advantages over its parent cartridge, at a significantly higher cost. While .17 HM2 sells for about four times the cost of .22 Long Rifle ammunition, it is still significantly cheaper than most centerfire ammunition and somewhat cheaper than the .17 HMR.
Aguila Ammunition is a Mexican manufacturer of firearms cartridges, under Industrias Tecnos of Cuernavaca. Industrias Tecnos was established in 1961, under the name Cartuchos Deportivos de México (It was changed to Tecnos in 1978), as a manufacturer of sporting and rimfire cartridges in collaboration with the American Remington Arms .
When fired from a full-length rifle barrel, most .22 short loadings are as quiet as if not quieter than, the average air rifle. [4] 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 ...
Rimfire cartridges originally were available in calibers up to 1 in (25 mm) caliber, however, all but the .22 in (5.6 mm) calibers and smaller eventually became obsolete. The .22 Long Rifle, also fired in pistols, is the most popular recreational caliber today because it is inexpensive, relatively quiet, and has very low recoil.
The .17 HM2 may or may not live up to its "Mach 2" name, depending on geographic location and conditions, with velocities out of a rifle of 2,100 ft/s (640 m/s). [3] The velocity is nearly double that of a standard .22 LR, which results in a much flatter trajectory out to its 175-yard (160 m) effective range. [4]