A world of difference. .22 Long Rifle is a low velocity, rimfire round. When a .22 LR round strikes a target, damage caused by the round will be limited to the crush cavity (damage caused by the round itself).
The .223, although having a projectile with the same diameter, is a much different cartridge. It's a high velocity centrefire cartridge, with a much heavier spitzer type projectile moving at a much higher velocity. Damage caused by this cartridge also includes hydrostatic pressure, which is caused by air displacement around the projectile.
A .22lr AS is a little more powerful. It's very similar to the .22 WMR
.223 inches for the .22LR, .224 inches for the .22 WMR.
36
None available currently.
401 - 178 = 223
5.62 is bigger
The Challenger II has an all steel frame and the Challenger III has an alloy frame; I don't know what the alloy is.
If it is one of the recent Colt .22LR AR15 rifles, then the answer is no - they are completely different internally.
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
.001 inches. Makes a difference depending on what you are shooting, how old the barrel is, etc..
While they are similar, the cartridges are not the same, with slight differences in the shoulder angle, length of neck. It is safe to fire .223 in a weapon chambered for 5.56, but 5.56 ammo in a weapon chambered for .223 may NOT be safe.
223