Not really. People want it to be impossible, but it was really simplistic shooting.
There was a “video game” that recreated the assassination from Oswald’s view. It was supposed to be a very accurate representation, ballistics wise, etc. They had a contest and gave a prize for the person coming closest to the timing and wounds of the event. Having some experience with rifles it was pretty apparant that the shots wouldn’t have been as hard as one might think. What I wondered was why he didn’t take out the driver as the car came toward him and then pick off everyone else in the car. I did that scenario and it worked out really well.