Nonsense. Using the same type of rifle, the actual shooting has been duplicated many times by many different people.
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The timing of the shots, certainly. Haven’t kept up on this as some have, but has the behavior of the pristine bullet, that passed through President Kennedy’s neck and Governor Connally’s chest and wrist and embedded itself in the Governor’s thigh. If so, this bullet traversed 15 layers of clothing, 7 layers of skin, and approximately 15 inches of tissue, struck a necktie knot, removed 4 inches of rib, and shattered a radius bone ever been duplicated?
(yes much of the above is a copy/paste from wikipedia)