I visited the 6th Floor museum in 96, before the window was roped off, and had a chance to look out down the line of fire. I also was impressed by how easy a shot it must've been with a scoped rifle. It felt like you were right on top of the stretch of road the president was hit on.
As did I in the early '90's ... then again a few years ago after the window area was roped off. I'm a former Marine and know full well the emphasis the Marine Corps puts on marksmanship. Oswald (as most know) was a former Marine ... he had been practicing at a local rifle range with his weapon. This was not a difficult shot ...