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The way the road angles down to go under the railway overpass meant that the direction of travel was straight away from the shooters position, so there was no leading involved, nor elevation changes relative to the shooters position at the time of the head shot. And the distance was maybe 150 meters at that point with a scoped rifle. Not a tough shot, as far as I can see.

Tale a look at these graphics for details:
http://mcadams.posc.mu.edu/plazao.jpg
http://mcadams.posc.mu.edu/tague4.gif

BTW, I have no real interest in the conspiracy aspects of this subject. The marksmanship aspects don't seem to make it an impossible shot, not even too difficult really. Though, as you say, Oswald was a cretin, and people like that tend to flake at critical times.

Hahaha....

The shooter was supposedly six stories up. The moving vehicle the President was in was at ground level and most definitely moving forward.

Unless the shooter was both directly behind as well as on a flat plain with the target it is by default a moving target requiring a lead. No amount of endless discussion can overrule that reality.

Nevertheless, the shoot could be pristine and I still dont see a Marksman's score putting a round center mass much less making a head shot from 150 whatevers out.

He is supposedly assasinating the President. It is inherent that his heart rate will be higher than normal. He has no spotter to mark his shots.

He doesnt drop the president with the first, his heart rate spikes.
He must lose the target as a result of chambering another round.
He must reaquire the target, lead and reinitialize his breathing discipline.
He must use proper trigger pull and squeeze off a second round.
He doesnt drop the president with the second shot, his heart rate spikes a second time and the anxiety rises considerably knowing that A. He is running out of time and B. He is a poor shot.
He must lose the target again as a result of chambering a third round.
He must reaquire the target, lead a second time [unsure of his first aimpoint and the location of the first impact] and reinitialize his breathing discipline.
He must use proper trigger pull and squeeze off a third round.
Again he has no spotter to call his shots therefore he has no idea where his rounds are impacting and as a result, cannot make the correct aimpoint corrections and proper leads with any signigant amount of confidence.

Anything in life is possible theoretically but 'real' shooters dont float their identity on anything like this scenario. No disrespect intended but if you are indeed an Expert [Marine Corps] shooter you'd know this.

BTW: What MCRD did you attend? What was your score?