.220 Swift

.220 Swift

Description

The .220 Swift is a semi-rimmed rifle cartridge developed by Winchester and introduced in 1935 for small game and vermin hunting. It was the first factory loaded rifle cartridge with a muzzle velocity of over 4,000 ft/s. Wikipedia
 
Case length0′ 2″
Rifling twist1 in 14–16 in (360–410 mm)
Case capacity47 gr H2O (3.0 cm3)
Overall length2.680, 2.580 H.P. Bullets
Produced1935