if you have a shallow enough impact angle, anything is possible. If I'm shooting one today with the CB I wait for as near as perpendicular as possible between skull and bullet path for this reason.
DING DING DING! You got it Dan. OK here is a picture of a Beaver skull that I mentioned earlier. That sucker is as flat as could be, ESPECIALLY between the eye sockets. Don't know how well you can tell in the pic, but trust me, that area is flat. If the rascal was looking straight at you, I can guarantee a glancing hit. If you were aiming from above the beaver's head, I am convinced it would kill him at said range with said kit gun.
BTW, nobody here is wanting to get into a pissin match, so no need to get defensive about your single (1 sample) experience. <grin>.