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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).
This was partly the result of the rifling being originally 1 in 16" and later 1 in 12". Custom barreled rifles with twists such as 1 in 9" can handle the latest 77 grain .224 bullets which are suitable for deer. The .224 bullets used in the decades by Swift fans that performed so badly were both too weak and too light to get good penetration.
The original production rifles by Roy Weatherby were built on commercial Mauser actions manufactured by FN, Brevex (magnum), and Mathieu (left hand). Weatherby would build a custom rifle from a customer's specifications for bespoke rifles, using any action the customer requested - provided the action was strong enough to tolerate the pressures for their desired cartridge.
A wildcat cartridge, often shortened to wildcat, is a custom-made cartridge for which ammunition and/or firearms are not mass-produced. These cartridges are often created as experimental variants to optimize a certain ballistic performance characteristic (such as the power, size, or efficiency) of an existing commercial cartridge, or may merely ...
Ruger No. 1 Varmint rifle in .223 Remington.Note the heavy barrel, bipod rest, large telescopic sight, and "DOPE" sheet on the stock for windage. A varmint rifle or varminter is a type of small-caliber, precision-oriented long gun (firearm or high-powered airgun) primarily used for varmint hunting and pest control.
An earlier high-velocity .22 caliber round from Weatherby called the .220 Weatherby Rocket was based on the .220 Swift though it was unsuccessful and never manufactured. [ 3 ] For more than 50 years, it was the only Weatherby cartridge to have an angled shoulder instead of the curved, double-radius shoulder found on other Weatherby cartridges.
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It was introduced with the Remington Model 722 bolt-action rifle. [4] The accuracy and flat trajectory of the bullet resulted in the adoption of the round for varmint and benchrest rifles. The faster .220 Swift and .22-250 Remington provided more reach than the .222 Remington. These larger cartridges have roughly 50% more power than the .222 ...