Also known as: .223 remington/5.56 nato, 223, .223/5.56, .223, .223 Remington, 223 Remington, 223 rem
Remington’s 223 is very similar to the 5.56x45 mm NATO military cartridges. The primary difference is in chamber shape and maximum pressure. While its possible to safely use the .223 Rem in a NATO rifle, it could produce excess pressures because of the slightly shortened throat. Remington created the .223 for the M16 service rifle, but it quickly caught on as a civilian cartridge as well.
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