In the right hands the .223 could be an excellent whitetail cartridge. You would need to be diciplined in shooting and shot placement.

I have taken 2 whitetailed doe with my 15" Encore in .223. both using a 55gn jacketed soft point bullet. Both shots were under 35 yards.

The .223 is easy to shoot and very accurate. If you are comfortable shooting it and your state allows the .22 centerfire for deer, you should give it a try.

The larger the caliber you use the more forgiving it will be for a misplaced or bad shot. Deer are very tough animals and a muscle or gut shot will most likley lead to long, slow, painful death no matter what you throw at them!