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The .220 Swift (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).
A major drawback after Winchester cooled to the Swift was finding a decent rifle to shoot it in. There were few chambered for it. These included the Savage Model 112, the Ruger No. 1 and 77V, the Sako, and Remington recently.
This cartridge is also sometimes known as the .22 Varminter or the .22 Wotkyns Original Swift. [2] Along with the .220 Swift, the .22-250 was one of the high-velocity .22 caliber cartridges that developed a reputation for remote wounding effects known as hydrostatic shock in the late 1930s and early 1940s. [3] [4]
Winchester Magnum rifle cartridges (2 C, 8 P) ... .220 Swift.345 Winchester Self-Loading; 0–9. 9×23mm Winchester; 9mm Winchester Magnum.22 Winchester Centerfire
However, the .220 Swift still holds the record as the fastest .22 caliber centerfire cartridge with a published velocity of 4,665 ft/s (1,422 m/s) using a 29-grain (1.9 g) projectile and 42 grains (2.7 g) of 3031 powder.
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The .219 Zipper / 5.7x49mmR cartridge was created by Winchester Repeating Arms in 1937 to be used in their lever-action Model 64 rifle. It is a 30-30 Winchester cartridge necked down to a .22 caliber bullet. Marlin Firearms also offered their Marlin Model 336 rifle (Marlin 336 Zipper) chambered for the cartridge.
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