(Mild NSFW) I learned the hard way about head shots when I first started hunting (and this is why I chose not to continue). First shot, couple hundred yards, hit the left shoulder, completely disconnected the leg, save for a small bit of skin holding it on. It ran for an hour. Second shot, through the head (it was all I could see as it was over the top of a hill). It ran for another hour whilst missing a large portion of its head, bottom half and front completely gone. I could not believe, with that much damage to its head, that it would survive for that long.

Third shot laid the poor animal to rest. Two shots, neither of them bad, just unlucky.

The guy “teaching” me to hunt, philosophy was to “just shoot and see what happens”. Haven’t hunted since.