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223 Remington Diagram

.223 Remington History

The .223 Remington is the most widely-used centerfire rifle cartridge in the developed world. In its 5.56x45 military form, it is the primary issue ammunition for the U.S. Military and NATO forces. It is a popular sporting cartridge, and probably the most commonly used centerfire varmint cartridge. In our Readers' Poll, the .223 Rem (both standard and improved) ranked first among preferred varmint rounds. The .223 Rem is efficient and versatile. It can sling 40-grainers past 3650 fps, and deliver 90gr VLDs accurately at 1000 yards. Its parent case, the .222 Remington, was once a mainstay of benchrest competition. Today, with custom match bullets, the .223 Remington can still deliver impressive accuracy, shooting well under quarter-MOA in a good rifle.

The .223 Rem traces its roots to the .222 Remington, a round popular with benchrest and varmint shooters in the 1950s. When the US military was looking for a new high-speed small-caliber round to replace the .308 Winchester (7.62x51), Remington started with the .222 Remington, and stretched it to increase powder capacity by about 20% in 1958 to make the .222 Remington Magnum. The cartridge was not accepted by the military, but it was introduced commercially. In 1964, the 5.56x45 mm, also based on a stretched .222 Rem case (and very similar to the .222 Rem Magnum), was adopted along with the new M-16 rifle. As with the .222 Rem Magnum, the new military case achieved enhanced velocity (over the .222 Rem) by increasing case capacity with a longer body section and shorter neck. This military modification of the .222 Rem was originally called the .222 Special but was later renamed the .223 Remington. In military metric nomenclature, the round is called the 5.56x45. For the full history of the 5.56x45 cartridge, read the 5.56x45 Timeline, by Daniel Watters.

The 223 Remington cartridge was originally devolved for M-16 rifle. It's original design was strictly created as a 5.56x45mm cartridge. Although the now more popular 223 Remington cartridge is slightly different. 5.56x45 Nato cartridge designs have slightly thicker brass than 223 remington therefore creating a higher chamber pressure and leaving less room for powder. The powder difference should be considered when reloading.

223 Remington vs 5.56 Nato M193

If you are using a sporting rifle it's recommended to use 223 Remington 5.56x45 ammo. If you have a rifle that is marked our modified for military spec then it safe to fire 5.56 M193 ball ammo. The 5.56mm NATO chambering, known as a NATO or mil-spec chamber, has a longer leade, which is the distance between the mouth of the cartridge and the point at which the rifling engages the bullet. The .223 Remington chambering, known as SAAMI chamber, is allowed to have a shorter leade, and is only required to be proof tested to the lower SAAMI chamber pressure. To address these issues, various proprietary chambers exist, such as the Wylde chamber (Rock River Arms) or the ArmaLite chamber, which are designed to handle both 5.56mm NATO and .223 Remington equally well. The dimensions and leade of the .223 Remington minimum C.I.P. chamber also differ from the 5.56mm NATO chamber specification.

223 Remington Uses

The most common use for 223 Remington ammo is varmint hunting. 223 Remington has light recoil and is easy to shoot. With the right load and rifle it can be very accurate. The military also uses 223 ammo for most of there light rifles, however they are loaded to NATO spec. and fire 5.56 M193 ball ammo.

223 Remington Technical Specifications

223 Remington Barrel Specifications.

• Common Barrel Twist Rate - 1/7 - 1/16
• Bore Groove Diameter - .224"

223 Remington Reloading Specifications.

• Bullet Diameter - .224"
• Maximum Case Length - 1.760"
• Trimmed Case Length - 1.750"
• Primer Size - Small Rifle

 

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