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Shank (.223 Remington) - 0.4370 / (NATO 5.56) - 0.4370 / (Difference) - 0.0000

Base Diameter (.223 Remington) - 0.3760 / (NATO 5.56) - 0.3780 / (Difference) - 0.0020

Shoulder Diameter (.223 Remington) - 0.3553 / (NATO 5.56) - 0.3560 / (Difference) - 0.0007

Neck-2 (.223 Remington) - 0.2550 / (NATO 5.56) - 0.2550 / (Difference) - 0.0000

Neck-2/Case Mouth (.223 Remington) - 0.2540 / (NATO 5.56) - 0.2550 / (Difference) - 0.0010

Freebore Diameter (.223 Remington) - 0.2245 / (NATO 5.56) - 0.2270 / (Difference) - 0.0025

Pilot Diameter (.223 Remington) - 0.2180 / (NATO 5.56) - 0.2180 / (Difference) - 0.0000

Base-to-Case Mouth (.223 Remington) - 1.7720 / (NATO 5.56) - 1.7750 / (Difference) - 0.0030

Base-to-Shoulder (.223 Remington) - 1.2340 / (NATO 5.56) - 1.2380 / (Difference) - 0.0040

Neck Length (.223 Remington) - 0.2200 / (NATO 5.56) - 0.2180 / (Difference) - -0.0020

Freebore Length (.223 Remington) - 0.0250 / (NATO 5.56) - 0.0500 / (Difference) - 0.0250

Rim/Belt Thickness (.223 Remington) - 0.2000 / (NATO 5.56) - 0.2000 / (Difference) - 0.0000

Shoulder Angle (Degrees) (.223 Remington) - 23.0 / (NATO 5.56) - 23.0 / (Difference) - 0.0

Throat Angle (Degrees) (.223 Remington) - 3.1 / (NATO 5.56) - 2.5 / (Difference) - -0.6

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12y ago
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9y ago

Not much. One is in caliber (hundredths of an inch) the other is in millimeter. So 5.56mm is equal to .223 caliber. In the civilian world, one typically would buy .223 rounds for their AR15, while in the military, one would use 5.56mm

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12y ago

No. You can run .223 Remington through a 5.56x45 chamber; you should not do the reverse.

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Q: What is the difference between a .223 round and a 5.56 NATO round?
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No


What is the difference between the .223 and 5.56 NATO round?

The 5.56 NATO round is a tad longer, about 0.4mm longer; but that has nothing to do with why you shouldn't intercnahge them. You shouldn't mix them because a 5.56 NATO chamber has a longer leade (cartrige mouth to rifleing engagement), a .223 chamber has a shorter leade. Shooting .223 out of a 5.56 chamber will not lead to any problems other than less-than-stellar acuracy, however, usind 5.56 in a .223 chamber WILL lead to premature wear out of the chamber and parts.


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Yes


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Depends on your configuration. The most common, by far, is .223 Remington/5.56x45mm NATO.


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Depends on your configuration. The most common, by far, is .223 Remington/5.56x45mm NATO.


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Can you shoot 223 in a Rock river 5.56x45?

Of course you can. The .223 is the civilian version of the 5.56x45mm NATO ammunition. They are slightly different but the difference is constantly neglected due to the fact that it is safe to shoot. Hope this helps.