The only shots we ever take on hogs is below the ear, or if they're looking straight at us through the eye. We mainly use .223, .22-250 or .243 and most any other .22 cal centerfire. Even at 350 yards my .77 gr bthp out of my .223 dropped a 275 boar dead in his tracks.
We never ever take shoulder shots, you mess up the meat, they run off and you have to track them. Go with the head shot.