In Texas we could hunt deer and hogs with the .223. As with every aspect of hunting it is up to the hunter to bring a strong sense of ethics with him/her and in once sense that could mean NOT taking a shot you think will cause needless suffering of the animal. In Colorado where I now live it is illegal to hunt deer and larger with a .223. Small game is fine. Having discussions with other hunters we all have reason to believe there was no factual data behind Colorado's decision to declare that the .223 was not powerful enough for white tail or mule deer. What I have never heard is that a .223 failed to bring down a deer. Does anyone know for a fact that deer are not killed by the .223 in 200 yards or less?