Es-Cajun,
I was hunting deer with a 223. I have taken several with the 223. I shoot the 63 gr Sr bullet. Some people may think caliber is too light for deer, but I say that depends upon where you intend to hit them and the size of the deer. Where I hunt, the deer are small, a 150 lbs field dress is a brute. Most I have shot where shot in the neck and did not take another step. 2 where shot broadside through the lungs, where the bullets passed completely through. I am more picky about shot placement with this caliber. Also will not shoot into cover if there is not a reasonable opening. My 2 hunting guns both shoot 1/2" groups regularly and never over 1" at 100 yards. With the lite recoil I use a rifle scope on the handgun.