With the right angle it's possible. There's urban legend of a 45 FMJ skidding along a dude's skull without penetrating - thick skull and came at an angle.
shot a javelina with a 30 carbine once and it glanced off the skull.
God bless Texas----------------------- Old 300 I will remain what i am until the day I die- A HUNTER......Sitting Bull Its not how you pick the booger.. but where you put it !! Roger V Hunter