He had fired the same rifle many times in years.No never. Bolt action mail order shitty cheap rifle with a bad scope used by someone who hadn’t fired a rifle in years and wasn’t skilled, couldn’t hit the broad side of a barn. Certainly not capable of committing the crime of the century in eight seconds only to be found in the lunchroom four floors down from the snipers nest, less than two minutes after the last round was fired casually drinking a Coke.
He did not need the scope and probablty used open sights.
Yes he was capable of it and that is proven fact. endless people have shown it was well within the range of the rifles capabilities and Oswald's skill.
Yes he had enough time to do it that is also proven fact whether you like it or not,