Federal Speed Shok 16 Gauge 2-3/4in #4 15/16oz Waterfowl Shotshells - 25 Rounds - Speed kills ducks and geese. Now it kills even cleaner with redesigned Federal Speed-Shok. Its Catalyst lead-free 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; Catalyst High-Performance Primer Provides The Most Complete, Consistent Ignition Possible; Optimized Velocities;