.223 vs 5.56 [Archive] - Glock Talk


View Full Version : .223 vs 5.56

09-01-2012, 21:10
Hey guys, I'm aware of the difference/history behind these cartridges.

..However, does anyone have data chronographing these two with 55 grain loads from the same gun? How much of a difference in velocity is it? I'm looking at wikipedia and it's saying the 55 grain .223 is running at 3,240 fps. Which seems high for a .223 if it indeed does have a few thousand less PSI for specs.

09-02-2012, 12:08
It has been awhile, but as I recall in the 55gr there was between 100 and 150fps difference. That was with Federal ammo, but you cannot be sure that both are loaded to the max.

09-02-2012, 21:50
5.56 is generally ~200fps faster than the same .223rem loading.