Another look at the back wound. in JFK Assassination Debate Posted March 3, 2017 · Edited March 3, 2017 by Robert Prudhomme 21 hours ago, George Sawtelle said: I believe the first shot caused the back wound. It occurred at or about Z-158 based on the blur analysis of Alvarez, Hartmann and Scott. It was loud enough to startle Zapruder. People in the parade thought the first shot sounded like a firecracker or backfire. The acoustical experts said it only registered 4 echos and therefore based on their criteria it was not a rifle shot. However I believe it was a rifle shot except that it was attenuated. The assassin used home made ammunition which is difficult to trace back to the assassin. Since the ammo was faulty the bullet did not travel 2200 ft/sec., more than likely much less than 2200 ft/sec. Okay, how fast would the bullet be travelling, in feet per second, to only penetrate the flesh of the back one inch? Did the shooter know the round was faulty? Why would a home made bullet be more difficult to trace back to an assassin than a factory made bullet? Was the round attenuated (reduced in force) or faulty, or a combination of the two? Was the rifle zeroed (sighted) in for that particular round?