In my opinion i think all you could use a 223 for is varmit hunting, you might could get away deer huntin with a perfectly placed shot. Obviously most inexperienced hunters are not going to make a perfect shot. If you ask for permission to hunt somewhere there more than likely to ask what your hunting with and when you say a military sniper rifle. They are almost always say NO. you barely stand a chance of gettin anywhere to hunt. As for boar you do not stand a chance of ethically killing an animal.