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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).
6.5mm Grendel :The Grendel uses the same head and rim from the .220 Russian and the 7.62x39 with a rim diameter of 0.441-0.449. The 6.5 Grendel bullets have a true diameter of 6.71mm / 0.264" and the 6.5 Grendel case can be formed from abundant 7.62x39 cases with a neck re-sizing die, and fire-forming a slight change to the shoulder, if the ...
Muzzle velocity is the speed of a projectile (bullet, pellet, slug, ... in modern rifles with high-velocity cartridges such as the .220 Swift and .204 Ruger, ...
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]
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.
.220 Swift was introduced in the Winchester Model 54 in 1935 as the first commercial cartridge with bullet velocity exceeding 4,000 feet (1,200 meters) per second. [4] The .220 Arrow is a wildcat modification of the .220 Swift. [7]
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.220 Rook (.220 Long Centrefire), an obsolete British cartridge of the 1880s .220 Russian (5.6×39mm), a 7.62×39mm cartridge necked down to hold a 5.6 mm bullet .220 Swift (5.56×56mmSR), the first cartridge (1935) with a muzzle velocity of over 4,000 ft/s (1,200 m/s)