Larry Sturdivan, a ballistic expert, in his book “The JFK Myths”, believed the Occipital Protuberance area made more sense.
What people forget is that we don’t have three points to line up:
1. TSBD sniper’s nest.
2. JFK’s entrance wound on the head.
3. JFK’s exit wound on the head.
There is a fourth point:
4. The frame of the windshield, roughly, because of a bullet fragment hit up high on the windshield, a second fragment hit even higher on the windshield frame itself, and a third, evidently, higher still that cleared both the windshield and its frame, likely striking James Tague.
These four points do not line up. The explanation is simple. Real world Ballistic observe bullet fragments following curved paths through ballistic gel, not straight lines. And they general follow a simple curve, not curing downward at one instant and then upward. They tend to follow a consistent curve. Once they start travelling through the air, they follow a much straighter line. Although they will curve some over a distance of 100 yards.
The near ‘Occipital Protuberance’ or EOP entrance makes sense. It strikes the back on the skull and starts to fragment. It curves in a random direction, which happens to be upwards. But the time it exits the skull, there are at least 3 major fragments, following slightly divergent paths. Which results in the windshield strikes and clearance.
The cowlick entrance does not make as much sense. The bullet would have to curve downward, then abruptly change direction and curve upward to exit the skull to result in the windshield strikes. And this would be true if fired from the TSBD sniper’s nest, or any other position not above the nearby building’s roofline.