I’ve heard the scope might have even been crooked or dodgey though on that rifle.
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From where he bought the rife:
“When they held the rifle up [on the news], I about fell through the floor,” Sharp recalls of the night of Nov. 22, 1963. “An $11 rifle?”
The rifle Oswald had reportedly chosen to use and bought under an alias was a cheap Italian model, Sharp said. The 6.5 mm Carcano, a military-grade rifle, was not expensive to make and therefore, very popular among consumers.
“It was a piece of junk,” Sharp said. Knowing that the warehouse on West Madison in Chicago sold much higher quality guns, Sharp was shocked at Oswald’s choice and at his success. “If you want good optics, you don’t buy them for three dollars [an estimate].”
http://newsarchive.medill.northwestern.edu/chicago/news-226036.html
It was also first reported that the rifle was a mauser:
http://spartacus-educational.com/JFKweitzman.htm
I could be wrong but I think, the Dallas Police Department did a competent job in the investigation but I also think that a crime of this magnitude back in 1963 was overwhelming and that they were probably unprepared.
In the Warren Commission report it states that the FBI had to shim the scope two times just to get a bullet into the field of view. And even then the scope would not stay on target once fired. So one must assume that in that picture Oswald might be lucky just to hit the car let alone the head. http://22november1963.org.uk/oswald-rifle-and-paraffin-tests#fn05_001
It was a dodgy rifle. The FBI sharpshooters who tested the rifle and scope had to put three metal shim under the scope before it was accurate enough for the FBI sharp shooter to attempt any recreation of the what Oswald was accused of.
But The Warren Commission wants us to believe that a mediocre shot like Oswald used this faulty weapon and scope to squeeze off three shots in less than six seconds with two of them hitting a moving target in the back and the head and the man sitting in front of him.