I picked up a used book, Mortal Error, by Bonar Menninger. The thoughts in the book came from a gun shop owner, Howard Donahue, who had also been one of the riflemen in an early tv reenactment/test of the Kennedy shooting.
Donahue says that the full metal jacket bullet fired by Oswald that went through Kennedy's neck and then Connelly acted like a full metal jacket bullet should have, but that the shot to Kennedy's head was not from a full metal jacket bullet. He says that the head shot was more likely from a .223 round with a thin jacket that allowed the round to blow up Kennedy's head like it did, which would not have happened with the full metal jacket round. (Did some experiments on pigs heads to prove his point.) He went through a lot of trajectory analysis that showed that the round came from directly behind Kennedy, and that the Secret Service agent standing in the car had an AR-15 in his hand. He thinks the agent lost his balance in all the excitement generated from the Oswald shot, and fired his AR-15 rifle accidentally, and that the cover up was not to hide a second assassin, but the mistake of the Secret Service.
There is also a website that used computers to recreate the shooting and they came to the conclusion that one bullet went through Kennedy and Connelly (the Oswald shot) and that the head shot to Kennedy appears to have come from behind, but then they dismiss the evidence of the second shot from behind because they can't believe it. This supports Donahue's conclusion.
http://www.jfkfiles.com/jfk/html/concl.htm
Interesting stuff and a different twist.
Donahue says that the full metal jacket bullet fired by Oswald that went through Kennedy's neck and then Connelly acted like a full metal jacket bullet should have, but that the shot to Kennedy's head was not from a full metal jacket bullet. He says that the head shot was more likely from a .223 round with a thin jacket that allowed the round to blow up Kennedy's head like it did, which would not have happened with the full metal jacket round. (Did some experiments on pigs heads to prove his point.) He went through a lot of trajectory analysis that showed that the round came from directly behind Kennedy, and that the Secret Service agent standing in the car had an AR-15 in his hand. He thinks the agent lost his balance in all the excitement generated from the Oswald shot, and fired his AR-15 rifle accidentally, and that the cover up was not to hide a second assassin, but the mistake of the Secret Service.
There is also a website that used computers to recreate the shooting and they came to the conclusion that one bullet went through Kennedy and Connelly (the Oswald shot) and that the head shot to Kennedy appears to have come from behind, but then they dismiss the evidence of the second shot from behind because they can't believe it. This supports Donahue's conclusion.
http://www.jfkfiles.com/jfk/html/concl.htm
Interesting stuff and a different twist.