The 5.56×45mm is a rimless bottlenecked intermediate cartridge family developed in the late 1970s in Belgium by FN Herstal.
It was standardized as the second standard service rifle cartridge for NATO forces as well as many non-NATO countries.
Though they are not entirely identical, the 5.56×45mm NATO cartridge family was derived from and is dimensionally similar to the .223 Remington cartridge
The technical characteristics may have minor differences according to the different manufacturers of the given product. The manufacturers reserve the right to make changes to the specified parameters.
Bullet type: 5.56 x 45 mm
Energy: at 24 J
Muzzel Velocity: 964.7 +- 12 m/s V23.77
Pressure: max. 3792 bar
Accuracy mean radius: max. 5.08 at 180 m
Bullet weight: appox. 3.56 g / 55 gr
Bullet length: 19.17 mm
Cartridge weight: 6.10 g
Cartridge length: 44.70 mm
Propelling weight: 1.64 g
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