.22 Long

.22 Long is a variety of .22 caliber rimfire ammunition. The .22 Long is the second-oldest of the surviving rimfire cartridges, dating back to 1871, when it was loaded with a 29 grain bullet and 5 grains of black powder, 25% more than the .22 Short it was based on. Wikipedia
 
Bullet diameter.222 in (5.6 mm)
Case length.613 in (15.6 mm)
Overall length.888 in (22.6 mm)
Parent case.22 Short
Rim diameter.278 in (7.1 mm)
Base diameter.226 in (5.7 mm)