This is the Zombie Max ammo made especially to be used on zombies, you see even serious businesses such as weapons manufacturers understand that one day the Zombie uprising will happen and only those who are prepared will be able to defend themselves and their families from the Walking Dead as their population outgrows the humans.
Here are some details on the appropriately named Zombie Max ammunition from Hornady;
Be PREPARED – supply yourself for the Zombie Apocalypse with Zombie Max ammunition from Hornady! Loaded with PROVEN Z-Max™ bullets…yes PROVEN Z-Max™ bullets (have you seen a Zombie?). Make sure your “bug out bag” is ready with nothing but the best! WARNING: THIS IS LIVE AMMUNITION. THIS IS NOT A TOY.
Source [Nerd Approved]