Deer hunters: what do you shoot?

[ETXHNTR]

LIVING IN EAST TEXAS IVE USED EVERYTHING FROM 30/30,30/06,.243 DOWN TO A .223. MOST COMMONLY I USE A REMINGTON 7400 CHAMBERED IN 30/06 WITH A NIKON BUCKMASTER SCOPE.
I WOULD REALLY LIKE INPUT ON THE .223 AS A DEER ROUND,IVE HEAD SHOT SEVERAL WITH IT BUT AM UNDECIDED IF I WANT TO ALLOW MY WIFE TO USE IT HER FIRST TIME TO KILL A DEER.IM REALLY WORRIED ABOUT POOR SHOT PLACEMENT.ITS ALL ABOUT AN ETHICAL,HUMANE KILL.
ALL COMMENTS OR THOUGHTS APPRECIATED.