Tom and Charles, I stop by the site infrequently but was looking for some material related to the third shot and saw this thread on the first shot.
Tom, I certainly agree with your comments related to the JCSA article, and would just add that subsequent data found after the journal submission additionally supports its conclusions. I also applaud Charles for your experimental setup, I really like what you’ve done trying to get a firsthand understanding on details of how the first shot was taken.
Since that journal analysis only focuses on the timing of the first shot, and given a shot taken from the sniper’s nest, it does not provide information on where the bullet went or how the rifle was being held or sight method that was used. That is something I have wondered about for quite a while, so am still open to understanding more about that. I do wonder if the iron sights or scope was used and I agree with Tom that the gun was probably purchased with a scope with its earlier intended use on Walker in mind.
Without physical evidence on bullet disposition, I’ll just provide my current best guess as to where the bullet went and why.
I have always suspected that since Oswald was a capable shooter, he did not miss horribly badly (like shooting wildly up in the air) when he was likely aiming to hit the president in the head. So, I have assumed the JFK miss (and concurrent limo miss) was not great and was probably a minimum limo miss. A minimum limo miss would be found in the pavement just ahead of where JFK was seated and almost damn near underneath the limo. The distance from JFK’s head perpendicular to that line of bullet travel would only be about 36 inches, which is a way to measure of the amount of the miss vs target.
Looking at the graph in the upper left frame on the photo below, a 36 inch miss seems to be consistent with a miss that was caused, at least in part, to the motion of the target, specifically the angular velocity of the target as it passed. Estimates on the magnitude of the shots miss from target (in inches) vs the angular velocity of the target (deg/sec) at each shot time from the sniper’s nest were plotted, and look nearly linear. If this were the case it would be consistent with Oswald missing his target by an amount proportional to the angular velocity of the target at the time of triggering for all shots. For the first shot it would be a minimum limo miss at ~36 inches (white line on upper right picture representing z124).
The bottom two snapshots are frames from the FBI and Secret Service reenactments of the shooting and the frame grabs are taken at about the z124 position like the upper picture, but they used scopes here. A white line is added from the president’s head to where their scopes were centered/pointed at for that time and shows what their temporary JFK miss would have been for their reenactment at that trigger time. The other line added is the minimum limo miss line proposed for Oswald. They are all slightly different in position, but note the distance (miss) from center of target is similar. Their aiming off-set was nearly identical to what Oswald’s would have been. Granted they had cameras attached to their set-up and Oswald didn’t, but they did have a familiarity with the exact movement of the “limo” as it passed by, where as it was a first-off and rushed event for Oswald. At that point both of these reenactments around a ~z124 positioning tended to have a similar minimum miss distance as that proposed for Oswald based on angular velocity.
Again, this is only my best estimation of what transpired during the shooting, but to me seems consistent with the data around the time of z124. I would be interested if any of this seems consistent with other reenactments or modeling on the positioning and handling of the rifle.