Alan,
Thank you for posting the clip from the Zapruder film I was originally referring to. Although I am still uncertain about the Landis claim, but IF he did find an intact bullet where the seat meets the trunk deck AND there was a shallow wound in the president's back, this explanation makes more sense to me than anything else I have read. I highly doubt it popped out during the sudden rear movement of the head shot, and no one was suggesting Jackie caught the bullet, just perhaps dislodged it when her gloved hand brushed the President's back on her way out of the back of the car. Her hand was right there. The grainy picture of Clint Hill holding on for dear life on the ride to Parkland Hospital not showing the bullet does not convince me it was not there. His thigh could have been holding it in place. I remain open to all possibilities.