I like head shots but only under certain circumstances, mainly because I don't like chasing after them. The animal has to be calm and completely unaware I'm close by, preferably feeding or even dozing off a bit. I get as close as possible but 100 yards is about my outer limit. I have stretched that on occasion, especially if the critter is bedded down. I have always gone for a shot just behind the eye, usually with my Win. .270, which is very accurate. Every shot I've taken under those circumstances has been like bolt of lightning for the critter and every one of them has folded up like a taco, on the spot. If they're the least bit nervous or twitchy, pawing the ground, 'playing' with others, anything but totally relaxed, it's a no go for me. Since it's worked every time for me, I think I must be doing something right!
Cheers,
crkckr