The .223 Remington (.223 Rem) is a cartridge with nearly the same external dimensions as the 5.56 x 45 mm NATO military cartridge. The dimensional specifi cations of 5.56 NATO and .223 Remington commercial brass cases are identical.. Here is a consolidate summary of all the rifle cartridges that are currently recognized by SAAMI. The purpose of this is to provide a quick glance of cartridge specs for the curious mind. The SAAMI Maximum Average Pressure (MAP) is listed in both the Copper Units of Pressure (CUP) and the Pounds per Square Inch (PSI). Some cartridges do not have either a PSI or CUP listed, and these values are.
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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 .224-inch (5.7 mm) diameter jacketed bullet, with weights ranging from 40 to 90 grains (2.6 to 5.8 g),[citation needed] though the most common loading by far is 55 grains (3.6 g.. Cartridge Specifications and Information for the 223 Remington (5.56MM NATO), as well as product listings related to the 223 Remington (5.56MM NATO).
