Fed Speed Shok 12ga 2.75" #4 25/250Speed kills, now it stops 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. Features : 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