High pressure die casting (HPDC) die gating system consists of a biscuit or a sprue, a runner, a gate, overflows and vents. The biscuit forms in the cold chamber HPDC machine shot sleeve and sprue in the hot chamber HPDC die sprue bushing. Sprue bushing is an active element in guiding the metal flow. Cold chamber HPDC shot sleeve does nothing much but offers a closed place to shoot the metal from.