You seem to have been well acquainted with Colonel Cooper because you are talking about him on a first name basis. If you had met him in person, you would have known right from the start that he did not take too keenly to be called "Jeff" by total strangers. People around him would have told you - clearly. So, you must have known him pretty well, no ?
And now some reading for you who already know all there is to know about "Double Action" revolvers and semi-automatic pistols:
To Ride, Shoot Straight, and Speak the Truth, Jeff Cooper, 1988, pages 114-120, The Management of the Double-Action Auto. A book published more than thirty years ago.
Do you see the expression trigger-cocking somewhere in that chapter ? Can you read it ?