A Blunderbuss can be used to deal with an entire squad of zombies!
When fired, it shoots 10 small projectiles with a wide spread.
Shooting a mob from nearby deals much more damage.
A full blast in close range is enough to kill an enderman in one shot, meaning it does over 40 Damage (20 Hearts), but the enderman will teleport away since endermen are immune to all projectiles (aka far ranged weapons)
You will need Ammunition to fire the Blunderbuss.