For the OP, no, there is no Hornady 'Vampire' ammo. At least not yet. I'm sure the guy meant Zombie ammo, or he thought that since they made Zombie ammo, they probably also made special ammo for vampires, werewolves, and any other infamous villain in the Twilight series.
Personally, I'm waiting for the Cthulhu-max ammo.
Really? Cthulhu Maxx? I can't wait for Chupacabra Maxx and Jersey Devil Maxx. Those two are the only ones that weird me out enough to make me wanna defend myself.