.256 Newton

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

Key specs

Type: Rifle
Origin: United States
Designer: Charles Newton
Introduced: 1913
Case type: rimless
Bullet diameter: 6.71 mm
Case length: 61.98 mm
Overall length: 86.36 mm
Typical bullet: 123 gr
Typical velocity: 946 m/s
Typical energy: 3,569 J
Parent case: .30-06 Springfield

Sources

Wikipedia: .256 Newton, Wikipedia