Before I even start, rest assured I am aware that a .223 is the wrong firearm for hunting cottontail rabbits (at least if you plan on eating them). That being said, is it possible to develop a load that might take the rabbit's head off, but would spare the edible parts? Body shots would likely end with a pink mist and an empty hide, but what about head shots? Would the shock wave alone turn the rabbit into mincemeat? What about bullet choice (ballistic tip, FMJ, mushrooming type, etc.)?