.22 Long Rifle

The .22 Long Rifle rimfire (5.6×15R) cartridge is a long established cartridge and is still by far the most common one in the world today. The cartridge is often referred to simply as’.22 LR’ and various arms especially Target Pistols have been manufactured in this caliber. The cartridge originated from the Flobert 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 gram) bullet of the .22 Extra Long. For many decades, it has been a very popular cartridge around the world. 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.

Source: eley