The rifles the Italian Army team uses have match grade barrels and are finely tuned by an expert armorer. That is not the rifle that Oswald had. Again, nice try, but strike two. Would you like to try for strike three?
The Carcano was not among the best military rifles ever made but it was totally capable of doing the job. It had some odd features such as gain twist rifling and the Mannlicher type clip loading but again it was about as accurate as any.