.17 Mach IV

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

Key specs

Type: Rifle
Origin: United States
Designer: Vern O Brien
Introduced: 1962
Case type: rimless, bottleneck
Bullet diameter: 4.37 mm
Case length: 35.56 mm
Overall length: 46.48 mm
Typical bullet: 25 gr
Typical velocity: 1,122 m/s
Typical energy: 1,081 J
Parent case: .221 Remington Fireball

Sources

Wikipedia: .17 Mach IV, Wikipedia