Here is a quick lesson on the .223 rifle cartridge.
The iconic .223 Remington cartridge was introduced by Remington in 1964.
Thanks to its predecessors the .222 Remington and .222 Remington Magnum, the .223 Remington cartridge has become one of the more popular choices. The availability of brass around the time it was conceived helped launch it into the mainstream, and the military’s adoption of the M16, which led to the AR-15 semi-automatic version, pushed it even further into popularity.
The bullet diameter is actually .224 despite the cartridge name. Barrel rifling twist vary with manufacturer and with different models so do your research to see what rifling rate of twist you may have and what bullet weight is best stabilized for best accuracy.
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Considering all the common centerfire cartridges available these days, the .223 remains widely used because of its availability and price; it’s one of the least expensive out there.
The typical uses of the .223 Remington cartridge is varmint hunting, along with self defense. Modern loadings of this cartridge have turned this decidedly small bore offering into a high velocity round with enough power and accuracy to even hunt deer-sized game with proper range and proper accuracy.
In places such as Alaska, some residents use this cartridge for just about everything, including moose. It’s power level, though, is best left to lighter game unless you are an expert shot at close range.
Coyotes and ground hogs are best served with this potent pill, the .223 Remington.
Around the same time that the .223 was introduced, the United States military adopted its almost twin, the 5.56 ball cartridge and designated as the M193.
Are they the same? Nope. The military 5.56 cartridge may be loaded to higher pressures than the .223 Remington sporting round, and if the 5.56 round is fired in a .223 Remington-only chambered barrel, there may be increased pressures.
If you have a firearm that is either chambered for 5.56, or a combination of 5.56 and .223 Remington, then you can safely use either round. If you have a .223 Remington chambered firearm only, keep the 5.56 military rounds out of it or you may have pressure problems.
Tons of brands make plenty of weights of .223 Remington ammo, and you’ll find that the multipurpose capabilities are great assets of the cartridge.