3 shots, 2 hits, Oswald shot left-handed as he was left-eye dominant. This is the conclusion I came to after researching the shooting for a history class. Ayoob wrote an article in American Handgunner around '92 talking about the Second Chance recreations. Two left-handers were able to make 3 hits in the five seconds by working the bolt with their right hand, resting the rifle on the ledge. Oswald could not have shot to his left in using this method. Remember, the FBI said the rifle scope was sighted for a lefty.
Also, the first shot missed, the second was the so-called "magic bullet" went thru Kennedy's neck and then into Connelly's chest, out the front of the chest, thru his wrist into his thigh. The sectional density of this 6.5mm fmj bullet is higher than that of the 7mm bullets Bell used to kill elephants. BTW, the "pristine" or "magic" bullet is far from pristine, having been bent into a banana shape with some lead extruded out the base by impact. The third was the head shot that acted exactly like Keith said it would, vaporizing the brain and ejecting it out the front exit wound, driving the head backward. A man named Lassiter did tests on human skulls filled with gelatin, shot with Carcano's at the same range and angle, and every skull fell back toward the shooter, as in the film.
3 shots, 2 hits, one dead president.