Introducing the .22 Long Rifle to a bunch of rifle cranks makes about as much sense as asking Vin Scully if he's ever heard of Sandy Koufax, so I'll keep this brief. Smith & Wesson produced the first .22 rimfire cartridge, which it chambered in its First Model revolver in 1857. Fourteen years later the Smith & Wesson case was extended 0.192 inch so it could hold an extra grain of powder, and thus the ".22 Short" and ".22 Long" names were adopted.
A .22 Extra Long followed, but it wasn't particularly accurate. Finally, in 1887, the ballisticians at J. Stevens Arms & Tool plugged a 40-grain bullet from the .22 Extra Long into a .22 Long case and, voila, the cartridge we all know and love as the .22 Long Rifle came to pass.
Read The Full Story On Rifle Shooter