What is a slingshot?
A slingshot or catapult is a small hand-powered projectile weapon. The classic form consists of a Y-shaped frame, with two natural rubber strips or tubes attached to the upper two ends. The other ends of the strips lead back to a pouch that holds the projectile. One hand holds the frame, while the other hand grasps the pocket and draws it back to the desired extent to provide power for the projectile—up to a full span of the arms with sufficiently long bands.
For much of their early history, slingshots were a "do-it-yourself" item, typically made from a forked branch to form the Y-shaped handle, with rubber strips sliced from items such as inner tubes or other sources of good vulcanized rubber, and loosing suitably sized stones.
What can I use in my slingshot?
Spherical projectiles are the most preferred and most accurate ammo you can shoot. This may be steel balls, lead balls, or marbles.
Firing projectiles, such as lead musket balls, buckshot, steel ball bearings, air gun pellets, or small nails
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