RE: Head Shots
For less ruined meat, I'd say hunt with a bow. It doesn't blast shrapnel all over the place, and you dont have to aim for the head. Now if the .243 is all you have, I beg you to be careful. Many a hunter blows off the lower jaw of his prey ( a pig once came into my house(AHH!!) with half his jaw missing...) and that can ruin a great hunting trip, knowing youve condemned a beautiful animal to a painful death.
Keep your shot sure, and make the kill painless. I wish you the best of luck.
NextGenHunter