Most of the paintball guns shoot a paintball of 0.68 calibers. Technically, they can also shoot a pepper ball it has the same caliber as the gun’s barrel. In fact, a pepper ball also works in the same manner as a paintball gun. It also shatters upon impact and contains pepper spray instead of paint.
Like pepper spray, a pepper ball can also cause irritation, itchiness, and breathing difficulty. Therefore it must be used for self-defense purposes only. Using them for recreational and fun purposes can seriously put you in trouble. For the safe side, you should also check your state laws for pepper balls.