The 220 Swift Ammo (5.56×56mmSR) is a semi-rimmed rifle cartridge developed by Winchester and introduced in 1935 for small game and varmint hunting. It was the first factory-loaded rifle cartridge with a muzzle velocity of over 1,200 m/s (4,000 ft/s), just under Mach.
Grosvenor Wotkyns, in an effort to achieve extremely high velocity, necked down the.250-3000 Savage to create the prototype for the.220 Swift between 1934 and 1935. The commercial variant manufactured by Winchester was based on a necked-down 6mm Lee Navy cartridge, but it has a bigger, more difficult-to-load protruding rim to accommodate 12mm-wide cartridges.
This headspace was already deemed antiquated by the 1930s. thread size.306″ Winchester’s Model 54 bolt-action rifle received a new caliber in 1935: the.220 Swift. Standard issue for the Winchester Model 70 bolt action from its inception in 1936 until its demise in 1964 was the.220 Swift.
Designed around the hard-hitting performance of the famous Hornady V-Max bullet, this ammunition is specifically designed for supremely accurate long-range shooting. The polymer tip enhances accuracy and promotes devastating expansion. It also increases the ballistic coefficient and stabilizes the bullet in flight. This ammunition is new production, non-corrosive, in boxer primed, reloadable brass cases.
Made In United States of America
|Grain Weight||55 Grains|
|Muzzle Velocity||3680 Feet Per Second|
|Muzzle Energy||1654 Foot Pounds|
|Bullet Style||Polymer Tip|
|Bullet Brand And Model||Hornady V-Max|
|G1 Ballistic Coefficient||0.255|
|Test Barrel Length||24 Inches|
|Country of Origin||United States of America|
|Shipping Weight||0.850 Pounds|