LIMIT 2 PER HOUSEHOLD - Forget what you think you know about smoothbore slug gun accuracy. The Federal Premium TruBall is the most consistent smoothbore slug on the market, capable of groups as tight as 1.4 in at 50 yd. 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.