can't begin to tell how many deer I've took with a 223, used the 64 gr win pp's for awhile, then went with just plain ole' 55 gr sp's, shot placement, common sense and dicepline are the key, take the good old pretty sunday front leg foreward double lung shot, and they sprint 60 yards to a pile-up. sure takes 40 to 50 yrds to pick up a bloodtrail, but they will leave a trail exit or not.
Most of the blood you get from a lung shot deer with small to med calibers is blown from the nose and mouth as the lungs fill with blood. I use to help farmers cull deer from cornfields and my weapon of choice was a rem. 788, 223 with a 4x12x40 on it. doe season I would set up my RRA varminter and never had an ounce of trouble taking deer with the 223's.
There are better choices, as has been said before but the 223 is adequate.
Born to Hunt, Forced to Work!