With a POS Italian WW-II Surplus bolt action rifle, probably only dropped once, with a cheap POS scope. It would actually have been easier without the scope to fire those rounds that quickly, because the FOV was so narrow that reacquisition would be more difficult.
The biggest question is, why would Oswald order that POS Italian iron, when he could just as easily have gotten an M-1, which would have been a much better "tool" for the "job" he had in mind. I don't think his finances were that bad, to force that choice due to economic reasons.
BTW, I too remember where I was, and what I was doing on that day.
All Mannlicher-Carcanos are thoroughly capable military rifles. It indeed was inexpensive bought as surplus, but that is by no means an indictment of it's suitability.
It was only an 54-88 yard shot. Even a 'crap' rifle will hit inside a 3-inch ring at that range.