.22 Long

The .22 Long is a rimfire cartridge. It is the second oldest rimfire, and was made by placing the 29 grain bullet of the .22 Short into a longer .613" case, increasing powder capacity, and therefore, speed. However, this proved to be a bad combination, being inherently less accurate than the original .22 Short. The .22LR made the .22 Long obsolete, when a heavier 40 grain bullet (taken from the .22 Extra Long) was placed in the same .613" case. This became the most popular cartridge in history.