Hydrostatic shock is mainly for rifle rounds from what I understand.
From work don by the FBI regarding pistol ammunition
"its interpretation are based are themselves based on myths such as knock-down power, energy transfer, hydrostatic shock, or the temporary cavity methodology of flawed work such as RII."
They don't agree with that theory, their main objective is that a round should penetrate at least 12" into the body in order to hit arteries and vital organs so that they cause serious incapacitating injury. Even hollow points are restricted by hitting bone and or clothing an