In High Pressure Die Casting (HPDC) the plunger moves with a specified shot profile, forcing the molten metal from the shot sleeve into the die cavity. The shot profile consists of two phases: a slow shot followed by a fast shot. Hence, it has a significant impact on the amount of entrained air during the metal feeding into the die cavity. The amount of entrained air affects the porosity of the casting. The level of porosity has a direct impact on the casting’s mechanical properties, its elongation, and strength. Numerical simulations have been carried out using Ansys-CFX to investigate the effect of various shot profiles on the amount of entrained air during the slow shot phase of the shot profile. Time-dependent simulations captured the effect of plunger speed on the wave forming inside the shot sleeve. The effect of critical slow shot velocities reported in the literature has been investigated.