I just read up on them, and it says Hammerhead's upper body is adamantium(I'm presuming secondary), but it says he easily defeated Spidey.
And Tombstone is still basically Tombstone. I think he and Cage fought back when Cage was in his early days, and Cage won, nowadays he'd stomp Lonnie.
And he can still take Hammerhead, he just has to fight smart.