.25 Short

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

Key specs

Type: Rimfire
Origin: United States
Introduced: 1860
Case type: rimmed, straight
Bullet diameter: 6.22 mm
Case length: 11.89 mm
Overall length: 19.81 mm
Typical bullet: 43 gr
Typical velocity: 229 m/s
Typical energy: 72 J

Sources

Wikipedia: .25 short, Wikipedia