Have you ever looked at the bone structure on a hog? 2 inches behind the ear is mostly muscle and gristle. The reason the shot didn't put the hog down for the count was poor bullet placement and not the fault of the caliber.

A hogs ear sits on the upper part of the skull and is towards the back of the skull. If you place the bullet directly below the ear it will destroy the brain. You're trying to blame a bullet when the blame lies with the shooter. You don't have to like it when someone points it out, but that doesn't mean it isn't correct.