.256 Winchester Magnum

.256 Winchester Magnum — Photo: Darkman IV (talk) · CC0 · background removed

Key specs

Type: Pistol
Origin: United States
Designer: Ruger, Winchester
Introduced: 1960
Case type: rimmed, bottleneck
Bullet diameter: 6.53 mm
Case length: 32.54 mm
Overall length: 40.39 mm
Typical bullet: 60 gr
Typical velocity: 716 m/s
Typical energy: 997 J
Parent case: .357 Magnum

Sources

Wikipedia: .256 Winchester Magnum, Wikipedia