The intermediate step between .22 Short and .22 LR — now largely obsolete but still produced for guns that don't cycle .22 LR.
Type: Rimfire
Introduced: 1871, United States
Parent case: .22 Short
Standardization: SAAMI
Bullet diameter: 0.223" (5.66 mm)
Case length: 0.595" (15.11 mm)
Overall length: 0.888" (22.55 mm)
Max pressure: 24,000 PSI
Rim type: Rimfire
Primer: Rimfire
Typical twist rate: 1:16
Muzzle velocity: 1000–1240 fps
Muzzle energy: 64–99 ft-lbs
Effective range: 75 yd
Common bullet weights: 29 gr
Primary use: Small Game, Pest Control
Production status: Active
Also known as: 22 Long · .22 Long RF
History: Introduced in 1871 as a longer case version of the .22 Short. Uses the same bullet as .22 Short in a longer case for more powder and velocity. The .22 LR arrived in 1887 and made the .22 Long largely redundant.
Notable firearms: Various revolvers and bolt actions
Similar cartridges: .22 Short, .22 LR