False premise. You have no idea what condition the scope was in at the time Oswald fired the shots. Even if you repeat this claim over and over again, it does not make it true. You are confusing your subjective desire for it to be true with a fact. And, of course, it wasn't even necessary for Oswald to have used the scope to commit this crime.
You wouldn't know a false premise if it bit you in the arse. The false premise is that you assume the scope was in alignment during the shooting and wound up grossly misaligned once the FBI got hold of it. If the FBI said the scope required 3 shims to even hit the target you can't assume that the scope was ever aligned to fit your narrative. That's the false premise, dufus.
Otherwise, all you have is a lonely palm print on the barrel that allegedly matches Oswald, with much less certainty than the 14 point match of Malcolm Wallace's print found on a box on the 6th floor of the TSBD. But the FBI laughed it off, like you do, and simply responded with "Not a match".
You have nothing. There is zero evidence that Oswald shot that rifle and plenty of evidence that he didn't. No prints. Wonky scope. No gunshot residue. And there wasn't even a valid trajectory from the 6th floor, into JFK's back and out his throat. Sorry to back up my premises with facts. You should try it some time.