Oswald was described as a mediocre shooter.
When I reported to Quantico for a specialty skills course, USMC instructors made a point of emphasizing how Marine Corps training made Oswald a great marksman. If we had trained with the bolt action Carcano 91/38, by the end of that course, given only iron sights, Oswald's feat would have been no problem.
BTW, in the mid-80's, a totally un-PC video game (I think for Atari) gave players an opportunity to duplicate Oswald's ambush. Needless to say, liberals were outraged, so the game was never released.
Cheers,
OLA
I have that game: “JFK Reloaded”.
Well made, great detail, a successful shot is not hard at all for anyone reasonably comfortable with a rifle.