Dowel rods are great ammo for a spud gun. There are many sizes. Dowels are very cheap. A 1/2" dowel (a perfect fit in 1/2" copper pipe costs about $0.50 per foot. Dowels are usually used in pneumatic cannons. Dowels can be modified by driving a wood screw through them, resulting in a powerful projectile that can penetrate deep into wood.

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