I just watched the ballistic gel test of that bullet. Wow, that expansion cavity is going to ruin internal organs if the round enters anywhere in the torso, from adams apple to groin! One shot drop with that baby.
http://m.youtube.com/watch?v=gAZqV64FR2o&desktop_uri=%2Fwatch%3Fv%3DgAZqV64FR2o
http://www.ar15.com/ammo/project/Self_Defense_Ammo_FAQ/DocGKRData/223%20Barrier%20Rounds.htm