Not sure I agree with the "point blank" theory in total, as it does not apply across the board between the Colt and Remington pistols. Both of which were used by the military.
I have read for years on different forums that the Colts were designed for longer ranges. And, my experience has always been they do shoot high at closer distances. It would be interesting to see some source material on the design of the Colt pistol with respect to their sighting and distance if you can cite it.