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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).
.220 Russian.220 Rook.220 Swift.221 Remington Fireball.22 Nosler.22-250 Remington.222 Remington.222 Remington Magnum.222 Rimmed.223 Remington.223 Winchester Super Short Magnum.224 Voboril.224 Boz.224 Weatherby Magnum.224 Valkyrie.225 Winchester.297/230 Morris.240 Apex.240 Weatherby Magnum.242 Rimless Nitro Express.243 Winchester
The .22-250 is similar to, but was outperformed by, the larger .220 Swift cartridge. However, it is in much wider use and has a larger variety of commercially available factory ammunition than the Swift, making it generally cheaper to shoot. The smaller powder load also contributes to more economical shooting for users who load their own ...
.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)
The Marmot is based on the .220 Swift with improved characteristics such as steeper sides and shoulder angle, but is not improved in the sense that you cannot fire form factory ammunition in its chamber. Performance with a 50-grain (3.2 g) bullet is approximately 3,875 ft/s (1,181 m/s) and with a 55-grain (3.6 g) bullet is approximately 3,755 ...
Bullet diameter.224 in (5.7 mm) Neck diameter.260 in (6.6 mm) ... it was intended as a replacement for the .220 Swift cartridge which had a reputation for burning out ...
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A guide to the recoil from the cartridge, and an indicator of bullet penetration potential. The .30-06 Springfield (at 2.064 lbf-s) is considered the upper limit for tolerable recoil for inexperienced rifle shooters. [2] Chg: Propellant charge, in grains; Dia: Bullet diameter, in inches; BC: Ballistic coefficient, G1 model; L: Case length (mm)