Minimum range would be the end of the barrel. Maximum effective range for a M-16 firing the dimensionally similar 5.56x45 is listed as 550 metres at a point target, and 800 at an area target. For a rifle firing commercial .223 Remington ammunition, you could expect the results to be similar.
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The 5.56 cartridge has a different neck angle from the .223 Remington, generates higher chamber pressures, and has different weight projectiles available. .223 Remington can be safely cycled through a rifle with a 5.56 chamber, but it is not recommended to use 5.56 ammo in a rifle with a .223 chamber.
759.777
30% of 223= 30% * 223= 0.3 * 223= 66.9
512923 x 223 = 223 x 23..........223..........x23=======..........669......+ 446========........5129
It is: 223 = CCXXIII