Then your memory is deficient, to put it charitably and generously. Even today, in Air Force basic training, trainees first zero/sight-in their rifles before firing for qualification. And you need to remember that you were not using a scope but were using the iron sights. One might be able to get away with relying on mechanical zero if they're using the iron sights, but no rifleman in his right mind would use a scope without first sighting-in the scope.
My memory could very well be at fault. I am still in contact with some high school classmates who went through USAF basic training very close to the same time I did. I am waiting to see what they might remember.
As far as scopes go, I currently have 11 rifles, seven of them have scopes. I can test four of them in my basement gun range. It is approximately 44-feet (14.7-yards) distance to the targets. If we designate a human head (average ~ 6.5” wide) as the target, that would be 6.5 MOA at 100-yards. This would calculate to a little over 7 MOA at the longest shot distance in Dealey Plaza on 11/22/63. And, if my math is correct, this 7 MOA would calculate to a target size of approximately 0.978” at 44-feet. On the NRA 10-meter air rifle targets this equals approximately anything within the 5-ring or better.
I did this exercise this morning just to satisfy myself. I have no doubts that you will go on believing whatever you wish to believe no matter what the actual evidence indicates. However you are welcome to visit us and I will demonstrate this again while you are watching. I started at one end of the gun rack and worked my way around to the other end. I picked up each rifle and shot three shots with each one. Before I shot I reduced the magnification of each scope to 4X with the exception of the first one which only goes as low as 8X. No other adjustments were made on the scopes or rifles. I have been busy with other projects and so I have not zeroed in or even picked up any of these rifles’ sights in many months. All of these rifles and their scopes were set up and adjusted by me, myself, and I long ago.
Below please see the first target. The gun is a Barra 250Z pellet gun. It is a relatively inexpensive gun compared to the top end competition rifles available. Three shots made one ragged hole. All three shots are within the target (5-ring or better). Now if I were shooting competitively, I would adjust the zero to try to hit the aim point of the center dot in the target. However it should be clear to anyone that sees this that it is close enough to hit the target in Dealey Plaza on 11/22/63.
Below is the second target. The rifle is a Benjamin Marauder pellet gun. Three shots made two holes, the one on the right is two overlapping holes. All three shots are well within the 5-ring.
Below is the third target. The rifle is a Crossman 3622 which is an entry level inexpensive pellet rifle. Three shots made three overlapping holes. All three shots touch or are within the 5-ring.
Below is the fourth target. The rifle is an Umarex Notos which is another inexpensive pellet rifle. Three shots made one oval shaped hole. All three shots are well within the five-ring.
For kicks and giggles I also took three shots with a Crossman Challenger rifle. These rifles are used by youth groups such as ROTC, 4-H, etc for competition. They are still relatively inexpensive (by specification of the groups involved). It has precision sights that are not magnified. Below is the target. Three shots made two holes, the one on the right is oval shaped. All three shots touched the 9-ring, with one touching the 10-dot.
There were no practice or sight-in shots taken with any of these rifles. The ammunition was different for each gun. Each different tin of pellets was chosen at random and was probably not the same ammo that was used for zeroing-in the rifles many months ago.
This is primo example of why discussions in this forum never go anywhere. They never go anywhere because you guys won't admit anything, and I mean anything, no matter how clear the facts are to a rational mind and even if the issue is not necessarily fatal to the lone-gunman theory.
-- I've pointed out the fact that even the Air Force still requires its personnel, new trainees and veterans alike, to zero their rifles before firing for qualification, as do the Army and the Marine Corps. I've pointed out that marksmanship manuals recommend zeroing before firing. I've pointed out that the FBI zeroed the alleged murder rifle before the WC's rifle test (gee, I wonder why).
Yet, you still argue that zeroing is no big deal and that a skilled, experienced rifleman will often skip zeroing even when accuracy is crucial.
-- I've pointed out that the Master-rated riflemen in the WC's rifle test, though firing under much easier conditions than those that Oswald would have faced, utterly failed to duplicate his alleged shooting feat, and this is crucial because they were using the alleged murder weapon itself after its scope had been zeroed.
I've pointed out that out of the 12 riflemen in the CBS rifle test, 10 of whom were highly skilled and experienced, only one--an expert and veteran gunman--managed to substantially duplicate Oswald's alleged feat by scoring two hits in under 6 seconds on his first attempt, and he was not required to fire through a half-open window and was allowed to fire nine practice shots right before the test, and his shots were counted as hits as long as they landed somewhere within the target silhouettes, even if they landed far outside the small area that Oswald allegedly hit.
Yet, you guys continue to claim that the alleged shooting feat would not have been very difficult, and that anyone who barely managed to qualify in the second of three Marine Corps rifle qualification categories would be skilled enough to perform the feat (never mind that some new recruits qualify in the second category even though they've never fired a rifle before in their lives, and never mind that Oswald was using a superb semi-automatic rifle when he fired at Marine Corps ranges and thus had no bolt action to work).
You don't want to admit that the alleged shooting feat would have been abjectly impossible for someone with Oswald's rifle skills, and that it would have been extremely difficult, if not impossible, even for a world-class rifleman.