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.223 or 223
2.23 is not a thing 5.56 is the metric measurement of .224 diameter bullets which are used in both 5.56x45mm and .223.
To go deeper, a civilian .223 Remington is almost identical to the military 5.56x45mm. Both use a bullet diameter of .224 and a weight between 40 grains and 77 grains. The differences without getting super technical are in SAAMI pressures. A .223 Remington cartridge produces less pressure than the military 5.56x45mm. You can shoot both out of a rifle marked 5.56x55mm or .223 Wylde but it is not recommended that you shoot 5.56x45mm in a rifle marked .223 Remington.
.223 Remington (SAAMI MAP): 55,000 psi (≈379.2 MPa) maximum average pressure (piezo).
5.56×45 mm NATO (NATO/EPVAT service pressure): ≈ 62,366 psi (≈ 430 MPa) service pressure (piezo).
Since we’re having fun, the other difference between .223 and 5.56 is the throat length, with 5.56 being longer. Wylde not only supports the higher pressure, but also splits the difference in the chamber to account for the difference in throats.
I.e., a .223 Wylde chamber has a longer throat than a .223 Remington chamber, but a shorter one than a 5.56 NATO chamber, which allows it to accurately fire both .223 Remington and 5.56 NATO ammunition.
I’ve been told shooting .223 in a 5.56 will wear out the chamber faster.. but haven’t exactly tested that.