How big is your Ball Python? I never feed anything bigger than a small small to any of my snakes, even the biggest girls. General rule is that the prey animal should be no bigger around than the thickest part of the snake. In my (and others) opinion, Ball Pythons are way overfed in captivity anyway. If they don't have small rats that week, feed a couple weans, or feed a couple large mice. Just my opinion through my experience.