.22 Extra Long

Photo coming soon: side view on a transparent background, with author and license.

Key specs

Type: Rimfire
Origin: United States
Introduced: 1880
Case type: rimmed, straight
Bullet diameter: 5.66 mm
Case length: 19.05 mm
Overall length: 29.46 mm
Typical bullet: 40 gr
Typical velocity: 320 m/s
Typical energy: 133 J

Sources

Wikipedia: .22 extra long, Wikipedia