The two-handed grip.

You want to grip the gun high on the tang or the backstrap. Your pinky, ring, and middle fingers of your strong hand are together with your middle finger up against the trigger guard. Your strong thumb points towards your target as does your index finger. To bring your support hand into the mix, you put your four fingers together with your index finger up against the trigger guard. Your strong thumb is on top of your weak thumb. Your strong hand pushes forward but grips a little bit less to allow your index finger to be isolated for trigger press. Your support hand pulls aggressively towards you, with your pinky finger of your support hand, engaged aggressively.