The HSCA also concluded that there were at least four shots fired, that there was a "high probability" that two gunmen fired at the President, and that it was probable that a conspiracy existed.
"The strongest element in the case against Lee Harvey Oswald was the Warren Commission's conclusion that his rifle had been found on the 6th floor of the Book Depository building. Yet Oswald never owned a 7.65 Mauser. When the FBI later reported that Oswald had purchased only a 6.5 Italian Manlicher-Carcano, the weapon at police headquarters in Dallas miraculously changed its (caliber), its make and its nationality. The Warren Commission concluded that a 6.5 Manlicher-Carcano, not a 7.65 German Mauser, had been discovered by the Dallas deputies." Mark Lane – assassination expert.
"Let me tell you what we did at Quantico," Hathcock said. "We reconstructed the whole thing: the angle, the range, the moving target, the time limit, the obstacles, everything. I don’t know how many times we tried it, but we couldn’t duplicate what the Warren Commission said Oswald did. Now if I can’t do it, how in the world could a guy who was a non-qual on the rifle range and later only qualified 'marksman' do it?" Former U.S. Marine sniper Craig Roberts
Kennedy's death certificate located the bullet at the third thoracic vertebra — which is too low to have exited his throat. Moreover, the bullet was traveling downward, since the shooter was by a sixth floor window. The autopsy cover sheet had a diagram of a body showing this same low placement at the third thoracic vertebra. The hole in back of Kennedy's shirt and jacket are also claimed to support a wound too low to be consistent with the Single Bullet Theory. Debra Conway, Assassination expert.