223 Remington cartridge designed by Remington Arms in the early 1960s.
Though they are not entirely identical, the 5.56×45mm NATO cartridge family was derived from and is dimensionally similar to the. On 28 October 1980, under STANAG 4172, it was standardized as the second standard service rifle cartridge for NATO forces as well as many non-NATO countries.
It consists of the SS109, L110, and SS111 cartridges. The 5.56×45mm NATO (official NATO nomenclature 5.56 NATO, but often pronounced 'five-five-six') is a rimless bottlenecked intermediate cartridge family developed in the late 1970s in Belgium by FN Herstal. Source(s): NATO EPVAT testing, QuickLOAD, SAAMI, C.I.P. NATO, Japan, South Korea, Taiwan, Australia, other major non-NATO allies
5.56×45mm NATO with measurement, left to right: Bullet, case, and complete cartridge
