Like I said, the theory is intriguing, even perhaps compelling. Here are two source links.
http://www.reelz.com/smokinggun/
http://www.jfkthesmokinggun.com/
The forensic investigation and findings are very interesting, particularly as they compare Mannlicher-Carcano ammo to AR-15 ammo:
.........
FORENSIC EVIDENCE
BALLISTICS/MEDICAL
BULLET PERFORMANCE
OSWALD’S FULL METAL JACKET BULLET
The 6.5 mm bullets in Lee Harvey Oswald’s WWII Mannlicher Carcano rifle were medium velocity and had thick copper jackets (called full metal jacket) designed to pass clean through a target. Oswald’s first shot hit the road near the limousine and peppered the area with fragments. A ricochet fragment hit President Kennedy on the scalp. Oswald’s second shot (the “Neck Shot”) struck the President in the back of the neck just to the right of the spine. It exited from his throat below the Adam’s apple, struck Texas Governor John Connally beneath and behind his right armpit, shattering four inches of Connally’s fifth rib, exited below his right nipple, crashed through his right wrist and thigh and was found virtually intact on a stretcher at Parkland Hospital. This bullet passed neatly through Kennedy and Connally causing seven different wounds. This was the classic behaviour of a full metal round.
THE AR-15’S SOFT POINT/HOLLOW POINT FRANGIBLE BULLET
The .223 rounds in the AR-15 assault rifle were high velocity, soft-point or hollow point, frangible bullets with a diameter of 5.56 millimeter. The accidentally fired bullet shattered the President’s skull and sent bone and brain matter exploding outwards. It left an exit wound the size of a small plate. As it exploded, molten droplets of lead solidified in the brain matter and left between 30 to 40 tiny lead fragments in Kennedy’s brain, according to the Warren Commission and the official Autopsy Report.
I’ll have to check it all out later.