Put up a full-sized man target at fifteen yards. Buckle on your holster, with the loaded automatic in it, the safety bolt at “safe.” Button the holster.
Stand with your back to the target, get your pistol out and put all your shots into the target in the shortest possible time.
This practice can be made still more difficult if as many man targets as your magazine holds cartridges are placed at various distances; hit all of them in the shortest time, taking them, not in rotation, but at random.
At “go” you turn and in so doing unbutton the holster flap, drawing the pistol, taking off the safety, and firing—all in one movement.
Occasionally, instead of firing all the shots, slip in the safety, and return the pistol to the holster after one shot.
See how quickly you can draw, shoot, and return to holster “all safe.”
The idea is to make the movement of drawing, taking off the safety, firing, returning the safety, and putting back in holster, all one continuous movement, and as nearly instantaneous as possible.
The safety should be off as the pistol gets clear of the holster; similarly the safety should be on again the instant the shot is fired.
If you are using a pistol having the additional safety squeeze in stock, there is far less danger in this practice, as this pistol squeeze only occurs as the trigger is pressed.
This is the only sort of practice I know of where an automatic pistol is safer than a revolver.