A hand-powered projectile assembly is provided for launching projectiles. The hand-powered projectile assembly includes an elastic projectile pouch, a hollow base ring and a hollow locking ring. The elastic projectile pouch having an open end is attached to the hollow base ring. The hollow base ring is attached to the locking ring. The hollow locking ring further maintains a tight seal with the elastic projectile pouch. The hand-powered projectile assembly further includes a cap to maintain the position of the projectiles inside the elastic projectile pouch. The cap maintains a watertight connection with the hollow base ring. The projectile exits through the open end of the elastic projectile pouch and the hollow base ring.