Hello All. I found out today, my 584 series 14 prefers 223/55gr fmj Factory ammo, over 5.56 military 55gr fmj ammo. 223 PMC Bronze was yielding steady 1.25" 5 shot groups at 50yds, looking through my 4x12x40 Vortex Diamondback. Best was just shy of the quarter mark. Any other 14's out there prefer 223 over 5.56?