The .223 Remington (5.56x45mm), also known as .223 Rem or .223, is a small-bore, high-powered, intermediate rifle cartridge. The bullet is approximately .224 inches (5.56 mm) in diameter, and 45 mm in length.
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| - The .223 Remington (5.56x45mm), also known as .223 Rem or .223, is a small-bore, high-powered, intermediate rifle cartridge. The bullet is approximately .224 inches (5.56 mm) in diameter, and 45 mm in length.
- The .223 Remington is a sporting cartridge with almost the same external dimensions as the 5.56x45mm NATO military cartridge. The name is commonly pronounced either two-two-three or two-twenty-three. It is loaded with a diameter, jacketed bullet, with weights ranging from , though the most common loading by far is . When loaded with a bullet that expands, tumbles, or fragments in tissue, this cartridge is capable of delivering devastating terminal performance. Proponents of the hydrostatic shock theory contend that this includes remote wounding effects known as hydrostatic shock.
- While the external case dimensions are very similar, the .223 Remington and 5.56x45mm differ in both maximum pressure and chamber shape. The maximum and mean pressures for some varieties of the 5.56 mm (different cartridge designations have different standards) exceed the SAAMI maxima for the .223 Remington, and the methods for measuring pressures differ between NATO and SAAMI. The 5.56 mm chamber specification has also changed since its adoption, as the current military loading (NATO SS-109 or US M855) uses longer, heavier bullets than the original loading. This has resulted in a lengthening of the throat in the 5.56 mm chamber. Thus, while .223 Remington ammunition can be safely fired in a 5.56 mm chambered gun, firing 5.56 mm ammunition in a .223 Remington chamber may produce pressures
- The .223 Remington is a cartridge with almost the same external dimensions as the 5.56×45mm NATO military cartridge. The name is commonly pronounced either two-two-three or two-twenty-three. It is loaded with a diameter jacketed bullet, with weights ranging from ,[citation needed] though the most common loading by far is .[citation needed]
- |- ! colspan="3" style="background: lightsteelblue; text-align: center; vertical-align: middle;" | .223 Remington |- | colspan="3" style="text-align: center; font-size: 90%; border-bottom: 1px solid #aaa; line-height: 1.25em;" | Image:30-30.jpg.223 Rem next to .30-30 (center) and .308 (right) |- ! style="padding-right: 1em;" | Type | colspan="2" | Rifle/varmint |- ! style="padding-right: 1em;" | Place of origin | colspan="2" | United States |- |- |- |- |- ! colspan="3" style="background: lightsteelblue; text-align: center; vertical-align: middle;" | Production history |- |- | Specifications mm ) mm ) mm ) mm ) mm
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| - Federal Cartridge, Remington, Tula, Hornady, PMC, Ultramax, many others
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| - Rimless; bottleneck; centerfire
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