"We ain't seen Jr. since he wandered off down by the hog pen."
First, I have never shot a hog with a shotgun; have killed several with rifles, one with a pistol. If I had to use buckshot, I'd try to get fairly close & would shoot for the head, period. If the first round does not kill it, at least it should be blind and stunned while you put the second one in and you are not going to damage a lot of, if any, meat. If its an old boar, let one of the other two guys shoot it and play back up, you can't clean or cook 'that' smell out of a boar.
