I’ve been shooting rifles for over 50 years now. And I’m a damn good shot. From where Oswald was stationed that was a 1 in a million shot.
The only “magic bullet” was 2 that Oswald could have shot that would have killed the President. The killing shot was from the front. Deer, Moose, Elk, rabbits, coons, humans....shot is shot and there is no way that a person..animal, reacts the way the President reacts when shot from the back.
Yes, the explosion OUT of the back of the head is plainly visible in the Zapruder film.