Are the .223 and the Remington 223 cartridges interchangeable in my AR15 223/5.56? Someone, please explain the differences between the 223/223 Remington and the 5.56/223 Remington. My Wyndam AR15 shoots 5.56/.223 ammo. Can I shoot the 223Remington in it?

Question

Are the .223 and the Remington 223 cartridges interchangeable in my AR15 223/5.56?  Someone, please explain the differences between the 223/223 Remington and the 5.56/223 Remington.  My Wyndam AR15 shoots 5.56/.223 ammo. Can I shoot the 223Remington in it?

Accepted Answer

The use of of the ".223" term is essentially short for the term ".223 Rem". Some ammunition manufacturers will include the "Rem" while others will not. The 5.56x45 NATO round will appear to be the same size as the .223, though it is a more powerful round than the .223. Since your rifle is chambered for the higher pressured round, 5.56, the .223 (Rem) round will automatically be included as a round that is safe to fire in your rifle.

However, if you rifle was chambered for only .223 Rem, you would not be able to fire 5.56 due to the higher pressure. 

Both the .223 and 5.56 round will serve your rifle well.

Manufacturer	PMC
Condition	New
Bullet Weight	55 Grain
Bullet Type	Full Metal Jacket Boat Tail (FMJ-BT)
Ammo Casing	Brass
Quantity	20
Ammo Caliber	.223 Remington
Manufacturer SKU	223A
Primer Type	Boxer
Muzzle Velocity (fps)	2900
Muzzle Energy (ft lbs)	1250
Attracts Magnet	No
UPC Barcode	741569060080

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223 Rem - 55 Grain FMJ Boat Tail - PMC - 20 Rounds

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