Shotgun

The Shotgun  is a ranged weapon which shoots a spread of four bullets. Each firing uses only one bullet, similar to the three-shot burst of the Clockwork Assault Rifle. The Shotgun can be purchased from the Arms Dealer after the Wall of Flesh has been defeated.

It is very effective at very short range, but rapidly loses effectiveness at longer ranges due to the shots spreading out.

Tips
Crystal Bullets are useful against mobs and will hit large groups, often destroying them in 2-3 shots. Cursed Bullets will help more in PvP though, because Crystal Bullets only hit players with their primary damage, since they become momentarily invulnerable. The greater primary damage of Cursed Bullets and the Cursed Inferno debuff will deal more damage in this case, often finishing players off as they retreat.