Fallingstar 223 datingpile

A variety of .223 Remington cartridges and a .308 Winchester (right) for comparison.

Ninety and ninety-five grain Sierra Matchking bullets are available for reloaders. The military version of the cartridge uses a 55 gr full metal jacket boat tail design and was designated M193.and is used by most makers of complete rifles and components.Many AR (Armalite) type rifles use 1:9, which is suitable for bullets up to 69 grains or 4.5 grams or 1:7, which is suitable for bullets up to 85 grains or 5.5 grams.US AR builders tend to follow the same trend as the US military in building rifles with Picatinny rails that support many accessories.The external dimensional specifications of .223 Remington and 5.56 NATO brass cases are identical.

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