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Bookmark or Share- What is the 45 in 5.56x45? And what does 5.56 mean? - AR15.COM5.56 is the bullet diameter, 45 is the case length - both in millimeters. As you stated, it's hotter than the .223 and that's the main difference - a 5.56 chamber is rated for higher pressure. Same goes for 7.62x51, 7.62x39, 7.62x54, 5.45x39 - bullet diameter followed by case length.
- 5.56×45mm NATO - WikipediaThe 5.56×45mm NATO (official NATO nomenclature 5.56 NATO, commonly pronounced "five-five-six") is a rimless bottlenecked centerfire intermediate cartridge family developed in the late 1970s in Belgium by FN Herstal. [5] . It consists of the SS109, L110, and SS111 cartridges.
- List of .45 caliber handguns - WikipediaThe .45 ACP (not to be confused with .45 Colt) cartridge is a very popular caliber due to its low velocity and relatively high stopping power. This caliber is associated most with the Colt M1911, logically, as ACP literally means 'Automatic Colt Pistol'. However, there are many more guns and variations on the M1911 that are chambered in .45 ACP.
- .223 Rem vs. 5.56x45mm NATO — What You Need to KnowThough many folks use “.223 Rem” and “5.56×45″ interchangeably, there are some meaningful differences in specifications for the original .223 Rem and the 5.56x45mm cartridge, as adopted by the U.S. military and NATO armies. The default chamber throats are slightly different and the .223 Rem is rated at 55,000 PSI vs. 62,366 PSI for the 5.56x45mm.*
- List of 5.56×45mm NATO firearms - WikipediaThe table below gives a list of firearms that can fire the 5.56×45mm NATO cartridge, first developed and used in the late 1970s for the M16 rifle, which to date, is the most widely produced weapon in this caliber. [1]
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