Rod is right on the money, but I also agree with Hal.
I was taught many years ago what the called "instinctive shooting". The method was to bring the gun up but to shoot where you are looking, it was easier if you had something to focus on. Our standard was 3" at 15 yards without the use of sights. the method was "very"similar the what Jim Gregg teaches.
http://www.jimgregg.net/