As I have said
REPEATEDLY IN OTHER THREADS. These are
MY opinion on the sequence. And after owning and firing a number of Carcanos I can attest the action is much faster than what the Warren Commission is using as it basis.
Remember that rifle was dropped on the floor between boxes of books while LHO made his escape, it wasn't just placed there in a proper manner. Once the scope was knocked askew it had to be realigned for the WC testing. There is no telling what other damage may have occured. Marina also testified that LHO practiced with the rifle quite often repeatedly loading and chambering rounds into the rifle.
Now for the pictures....http://www.assassinationresearch.com
There are blow ups of frame by frame of the entire Zapruder film, including the sprocket section.