Just the other evening I was channel surfing and came across yet another documentary on the Kennedy assassination in Dallas. It was either Discovery Channel or the History Channel. Anyway, with modern day forensics they did the sequencing of the shots, as well as the trajectory of the bullets and determined, conclusively, the shots were all fired from Oswald's perch in the Texas Book Depositary building. Which has been my belief for a number of years; bottom line, Oswald as an assassin got incredibly lucky that day.
I have seen most of those documentaries also, including the Peter Jennings special where they made a mistake and rotated the program and showed the exit trak comming out of JFK's chest instead of the throat. You must remember who is paying for the program. A conspirist will prove he couldn't do it or not show the program. The SBT's will prove he did do it or you won't see that show either. The point here is that none of the shows I have seen ever timed the first shot. They time to first to second and the second to third shot. If anyone can aim at a moving target and fire in 6/10 seconds then we will have something. Also williams on the fifth floor said JFK's hand went up (apparently when he was hit the first time) and then the gun went off.