223 Ammo for sale at reelammunition.com

.223 Remington Ammo Usage and commercial offerings:

The .223 Remington has become one of the most popular cartridges and is currently used in a wide range of semiautomatic and manual-action rifles and even handguns, such as the Colt AR-15, Ruger Mini-14, Remington Model 700, Remington XP-100, etc.[20][21] The popularity of .223 Remington is so great, that in the US it virtually eliminated all other similar .22 caliber center-fire varmint riflecartridges.

It is commercially loaded with 0.224-inch (5.7 mm) diameter jacketed bullets, with weights ranging from 35 to 85 grains (2.27 to 5.8 g), with the most common loading by far being 55 gr (3.6 g). Ninety-grain and 95-grain Sierra Matchking bullets are available for reloaders.

What is .223 Remington ammo?

The .223 Remington cartridge was developed along with the AR-15 rifle for the Military. This cartridge is most commonly found in 55 grain (gr) and offers shooters a mild recoil and straight trajectory, making it popular as a varmint gun or for taking down small predators, such as coyotes. .223 ammo can be fired from guns chambered for the more powerful cartridge while it is similar in size to the 5.56*45mm NATO round, making it a favorite among shooters of AR-style guns.

.223 Remington vs. 5.56×45mm NA

In 1980, the .223 Remington was transformed into a new cartridge and designated 5.56×45mm NATO

According to Dimensions

The external dimensional specifications of .223 Remington and 5.56×45mm NATO brass cases are nearly identical. The cases tend to have similar case capacity when measured (case capacities have been observed to vary by as much as 2.6 grains (0.17 ml)), although the shoulder profile and neck length are not the same and 5.56×45mm NATO cartridge cases tend be slightly thicker to accommodate higher chamber pressures.

Comparisons

The table contains some estimated pressures based on normal proofing practice and on the known increases in pressure caused by bullet setback (which is a similar occurrence with regard to pressure). The proof pressure of M197 is 70,000 psi.[18]

The following table shows the differences in nomenclature, rifling, throating, and normal, maximum, and safe pressures:

Cartridge	US designation	NATO designation	Bullet	Rifling	Throat	Pressure in NATO chamber	in 223 SAAMI chamber	Safe sustained
223 Remington	223 Rem		55 gr FMJ	1:14	tight	52,000 psi (359 MPa)	52,000 psi (359 MPa)	Yes


223 Remington	M197		C10524197-56-2	1:12	tight	70,000 psi (483 MPa)	70,000 psi (483 MPa)	One time only
5.56×45 mm NATO	M855	SS109	62 gr ball	1:7	long	62,366 psi (430 MPa) EPVAT	over 70,000 psi (483 MPa)	No
5.56×45 mm NATO	M856	L110	77 gr Tracer	1:7	long	62,366 psi (430 MPa) EPVAT	over 70,000 psi (483 MPa)	No
5.56×45 mm NATO	M857	SS111	Tungsten carbide	1:7	long	62,366 psi (430 MPa) EPVAT	over 70,000 psi (483 MPa)	No
5.56×45 mm NATO	Proof	Proof	unknown	1:7	Long	77,958 psi (538 MPa) EPVAT	82,250 psi (567 MPa) estimated	No