Greatest Cartridges: The Rise of the 5.56X45 NATO - Gun Digest
https://gundigest.com/gear-ammo/reloading/greatest-cartridges-the-rise-of-the-5-56x45-nato
WEBNov 28, 2014 · NATO agreed in 1977 to accept the 5.56×45 round as a NATO standard, with some minor variations in loading and bullet design. The acceptance of the M16 and its 5.56×45 cartridge was not without controversy. Initially, the rifle was criticized frequently after its introduction to the battlefield in RVN.
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