Blunderbuss, Bullets (3.5e Equipment)
From D&D Wiki
These small leaden projectiles are carved with some measure of care to not obstruct or damage the barrel of gunpowder powered weapons. They are fabricated for the common Blunderbuss. Nominal price for such projectiles are 1 gp per twenty bullets. Arming a blunderbuss also requires a pellet of Gunpowder.