The evidence suggests that LHO did some substantial planning for the Walker attempt. Therefore I would fully expect that he had a pretty good estimate of the distance involved with the place that he planned to shoot from. LHO apparently paid extra money for the scope, so it seems to me that he planned to use it for the Walker attempt. With the above in mind, and Marina’s reports of LHO practicing with the rifle, I have to believe that he zeroed the scope for his estimated distance of the Walker attempt (~100’). And I would expect that the scope was still zeroed for that ~100’ distance on 11/22/63.
The iron sights are another story. They are fixed (non-adjustable) at 200-meters if I remember correctly. I will try to find out the exact distance that the iron sights are above the center of the bore and see if I can come up with a ballistics calculation of how far off they would have been at the various distances of the Walker attempt and the distances involved in Dealey Plaza.
The fact that his shot struck the very bottom of the open window sash indicates to me his shot was high of his intended line of fire. Rather than the shot going through the open window, it hit the bottom of the sash. Just an educated guess but I doubt he used the scope for the Walker shooting. The iron sights were fixed and zeroed for 200 meters so at close range, the rifle would aim high. Oswald should have known that but he might have just forgot to make the adjustment.
