Federal Speed-Shok 10 Gauge 3-1/2in #2 1-1/2oz Waterfowl Shotshells - 25 Rounds - Speed kills ducks and geese. Now it kills even cleaner with redesigned Federal Speed-Shok. Its high-performance lead-free primer and fast-burning powder dramatically reduce residue, while its optimized velocities knock birds out of the sky. 10 Gauge ammo from Federal is optimal for waterfowl hunting. 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