page_title: 5.56×45mm NATO
section_title: History
hierarchical_section_title: 5.56×45mm NATO / History
caption_attribution_description: English: The 7.62x51mm NATO and 5.56x45mm NATO cartridges compared to a AA battery
context_page_description: The 5.56×45mm NATO is a rimless bottlenecked intermediate cartridge family developed in the late 1970s in Belgium by FN Herstal. It consists of the SS109, SS110, and SS111 cartridges. 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. 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 designed by Remington Arms in the early 1960s.
context_section_description: In 1954, the larger 7.62×51mm NATO rifle cartridge was selected as the first standard NATO rifle cartridge. At the time of selection there had been criticism that the recoil power of the 7.62×51mm NATO, when fired from a hand-held lightweight modern service rifle, did not allow a sufficient automatic rate of fire for modern combat.
  The British had extensive evidence through their own experimentation with intermediate cartridges since 1945 and were on the point of adopting a .280 inch (7 mm) cartridge when the selection of the 7.62×51mm NATO was made. The FN company had also been involved in the development of the .280 round, including developing a version of the FN FAL in .280. The concerns about recoil and effectiveness were effectively overruled by the US within NATO, and the other NATO nations accepted that standardization was more important at the time than selection of the ideal cartridge.
  The development of the cartridge that eventually became the .223 Remington (from which 5.56mm NATO would eventually be developed) would be intrinsically linked to the development of a new lightweight combat rifle. The cartridge and rifle were developed as one unit by Fairchild Industries, Remington Arms, and several engineers working toward a goal developed by U.S. Continental Army Command (CONARC). Early development work began in 1957. A project to create a small-calibre, high-velocity (SCHV) firearm was created. Eugene Stoner of Armalite was invited to scale down the AR-10 (7.62mm) design. Winchester was also invited to participate. The parameters that were requested by CONARC:
  .22 Caliber
  Bullet exceeding supersonic speed at 500 yards
  Rifle weight of 6 lb
  Magazine capacity of 20 rounds
  Select fire for both semi-automatic and fully automatic use
  Penetration of US steel helmet through one side at 500 yards
  Penetration of .135-inch steel plate at 500 yards
  Accuracy and ballistics equal to M2 ball ammunition (.30-06 Springfield) out to 500 yards
  Wounding ability equal to M1 Carbine
  Springfield Armory's Earle Harvey lengthened the .222 Remington cartridge case to meet the requirements. It was then known as the .224 Springfield. Concurrently with the SCHV project, Springfield Armory was developing a 7.62mm rifle. Harvey was ordered to cease all work on the SCHV to avoid any competition of resources.
  Eugene Stoner of Armalite (a division of Fairchild Industries) had been advised to produce a scaled-down version of the 7.62mm AR-10 design. In May 1957 Stoner gave a live-fire demonstration of the prototype of the AR-15 for General Willard Wyman, Commander-in-Chief of CONARC. As a result, CONARC ordered rifles to test. Stoner and Sierra Bullet's Frank Snow began work on the .222 Remington cartridge. Using a ballistic calculator, they determined that a 55-grain bullet would have to be fired at 3,300 ft/s (1,006 m/s) to achieve the 500-yard performance necessary.
  Robert Hutton (technical editor of Guns & Ammo magazine) started development of a powder load to reach the 3,300 ft/s (1,006 m/s) goal. He used DuPont IMR4198, IMR3031, and an Olin Powder to work up loads. Testing was done with a Remington 722 rifle with a 22-inch Apex barrel. During a public demonstration the round successfully penetrated the U.S. steel helmet as required. But testing showed chamber pressures to be excessively high.
  Stoner contacted both Winchester and Remington about increasing the case capacity. Remington created a larger cartridge called the .222 Special, which was loaded with DuPont IMR4475 powder.
  During parallel testing of the T44E4 (future M14) and the AR-15 in 1958, the T44E4 experienced 16 failures per 1,000 rounds fired compared to 6.1 for the AR-15.
  Due to several different .222 caliber cartridges being developed for the SCHV project, the 222 Special was renamed .223 Remington in 1959. In May of that year, a report was produced stating that 5 to 7-man squads armed with AR-15 rifles had a higher hit probability than 11-man squads armed with M-14 rifles. At a 4th of July picnic, Air Force General Curtis LeMay fired the AR-15 and was very impressed with i
caption: The 7.62×51mm NATO and 5.56×45mm NATO cartridges compared to an AA battery
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