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"Btw didn't "they" need to fire C2766 to produce the three shells by the window, CE399 and the two fragments in the Limo?"
Duh!.... Do you actually believe that the spent shells had to have been fired at the time of the coup d'etat? In reality there is good reason to doubt that the spent shells were fired that day......
The spent shells exclusively came from Oswald's rifle,
bullet fragments found in Kennedy's limo exclusively came from Oswald's rifle
a man matching Oswald description was seen with a rifle in the sniper's nest window,
shells were found at this window,
Oswald's prints were found on Oswald's rifle,
3 types of fibers from Oswald's arrest shirt matched 3 types of fibers found on the rifle,
Oswald's prints were found on the boxes in the snipers nest and the prints were recent,
Oswald immediately left work, killed a cop and tried to kill more cops when he was arrested.
JohnM