.223 Remington Wikipedia

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.. In those cases the revision will initially be posted in this section until such time as the drawing is updated in the SAAMI Standards. A cartridge/chamber design that has been previously subject to revision will have both an issue date and a revision date on the drawing. 16 ga. 2 3/4″ 224 Valkyrie V&P 6.5 Grendel 30 Luger 44-40 Winchester

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Load data for caliber ".223 Rem. (5.56 x 45 NATO)" The .223 Remington (also known as 5.56x45mm NATO) cartridge is a popular rifle round that was developed by Remington Arms in 1964. It has an overall length of 2.26" and is a rimless, bottle-necked case measuring 1.76" long with a bullet weight ranging from 30 to 77 grains.. The .223 Remington has a 1.87 mL (28.8 gr H 2 O) cartridge case capacity. [3] .223 Remington maximum CIP cartridge dimensions. All sizes in millimeters (mm). [9] Americans would define the shoulder angle at alpha/2 = 23 degrees. The common rifling twist rate for this cartridge is 305 mm (1 in 12 in), 6 grooves, Ø lands = 5.56 millimetres (0.219 in), Ø grooves = 5.69 millimetres (0.224 in.

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