well lets see bullets can hurt him it just takes more just the same with blades I mean his skin isn't impenetrable it just takes more force. like small caliber handguns eh, but the higher ones can go through him. now the elements I will need help for the info like fire how much does it take I know it should be me but going by comic books like you said they shrug off alot
Hm, well you could go with him being able to handle specific damage better. Like...he can take physical punishment quite a lot but elemental and mental attacks are something he can't defend against.