Spherical projectiles are the most preferred and most accurate ammo you can shoot.  This may be steel balls, lead balls, or marbles. Shooting a spherical projectile provides the shooter with the most consistent and repeatable accuracy.

Yes, slingshots have been responsible for putting many a meal on the table and the challenge of hunting with a slingshot is addictive.

However, hunting with a slingshot requires considerable skill and respect for your prey.

It is imperative that you have sufficient skill to place your projectile in the kill zone and be capable of doing so with a band/ammo combination that generates enough velocity and energy to ethically harvest the prey.