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I got some 07 headstamp stuff, goes bang everytime in every gun that I own, also it chrono's pretty dam good. 3050 fps out of a 14.5" barreled AR.

Prvi M193 55gr FMJ, 2007 Headstamp
Mean Average: 3041 (20 shots)
High: 3063
Low: 3012
Standard Deviation: 16.19
20-shot-group mean diameter: 2.5"
 

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3050? That's definitely 5.56, not .223.
no doubt, 5.56 are loaded to higher pressures and hotter. I will give you a clue, "M193" should give you an idea that is is 5.56 NATO round. So for 20" Barrel you are looking at 3200+ FPS
 
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