The term 556 in a civilian environment usually refers to.223 Remington round. 223 and 5.56 NATO have similar dimensions, but they have different chamberings and have different pressures. The.223 was designed for hunting and other civilian usages, while the 5.56 NATO is designed mainly for military usage.When did the 5.56mm round become the standard?
Now, the 5.56mm has become the global standard in small arms calibers. In terms of conflicts, the round has seen use in every American conflict since Vietnam, where it became popular in short-range jungle fights. The U.S. has also deployed the round in Latin America, Asia, Africa, and the Middle East.How much velocity does a Black Hills 223 lose?
The Black Hills 223 68-grain heavy match was lost velocity at a fairly consistent rate. The largest decrease in velocity resulted from the barrel being cut from 20″ to 19″ with a loss of 41 ft/sec. Of the 220 test rounds fired, we logged 6 light primer strikes on the Federal M193 and 1 on the Winchester M855.What's the difference between a 5.56 and a 45mm?
The 5.56 * 45mm refers to two main cartridges, the .223 Remington and the 5.56 * 45mm NATO. Often, when people talk about the 5.56, they are usually referring to the 5.56 NATO. The .223 was first designed in 1957 as a rifle cartridge for commercial hunting.