u r not listening.......he cant drive it through the skin......if someone like colossus ....had the claws he could drive them into the skin becasue he is class 100....i have no doubt that wolverine's claws can go through but he cant do it....its like u have a knife made of steel.and u try to drive it through a tree...now u wont able 2.....but if the knife was fired at a high velocity....or someone really strong came along then he could drive it through the tree.....
Actually if a machine gun can penetrate Zilly then so can claws. After projectiles reach a certain speed there ability to penetrate lessens (especially with bullets which destroy themselves in order to cause more damage.) Often times a slower object like an arrow will penetrate further than a bullet. considering how sharp Wolvie's claws are it'd probably be like pushing a knife into an apple.