Federal Premium, Vital Shok, 12 Gauge 3, TruBall Slug, Hollow Point, 1oz, 5 Round Box PB131RS Federal Premium's TruBall is the most consistent smoothbore slug on the market, capable of tight groups at 50 yards. The TruBall system locks the components together, centering and pushing the rifled slug out of the barrel. This promotes clean separation of components after muzzle exit to ensure the best accuracy.