I had a 2 day semi private lesson with TGO. He said it was originated by Bill Wilson. Back then, the late 80s', a Master Class Bill drill was, surrender start, one target, 7 yards, draw, shoot 6 As' in 2 seconds or less. Must be all A zone or it does not count. I am sure GMs are doing this in 1.4 seconds or less now. I have made the 6 A zone in under 2 seconds, 9 times, ever. I watched TGO do 7 in a row. On the 8th one he pulled a C zone. Back then he said 7 in a row was the world record. If he had made #8 he would have set the new record. I am sure he can do many more now.