Federal Truball 20 Gauge 3in 3/4in Rifled Slug Shotshells - 5 Rounds - 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 inch 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. A plastic ball between the wad and slug increases smoothbore accuracy Capable of 1.4in groups at 50 yards Clean separation of components after muzzle exit Increased downrange energy