Is it 5.56?
Atk lists it as 5.56x45mm, but the pn indicates .223, and the advertised velocity straddles the fence.
Is it still top dog in the barrier blind world of .224 loaded ammo?
LE223T3 and LE223T1 are the best of the .223 pressure loads–I would be quite happy using either one as a duty round. Accuracy typically runs from 1.5-3" or so at 100 yds when fired from a Colt 6920.