.223 Remington VS 5.56

. What’s In a Name? Most gun guys know the history of the .223 Remington and that, like so many of our popular cartridges, it started life in the military. Because the military switched to metric designations sometime in the fifties, this little 22-caliber cartridge was called the 5.56X45 NATO (commonly referred to as 5.56) when it was first introduced. The 5.56 surfaced in 1957 as an experimental cartridge in the AR-15 rifle. The concept was to develop a smaller, … Continue reading