Federal Speed-Shok 20 Gauge 2-3/4in #6 3/4oz Waterfowl Shotshells - 25 Rounds - Speed kills ducks and geese. Now it kills even cleaner with redesigned Federal Speed-Shok. Its high-performance primer and fast-burning powder dramatically reduce residue, while its optimized velocities knock birds out of the sky. Improved loads Fast-burning, clean propellant leaves drastically less residue in the barrel and action High-performance primer provides the most complete, consistent ignition possible Optimized velocities