Plainly, nobody needs to be qualified as a mathematician nor a career in external ballistics to realize that it is quite impossible to have the same bullet, leaving the same rifle with the same sights and sight radius, at the same muzzle velocity, take two completely different paths with 2.5 MOA of variation, from the same point of firing to the same point of impact at the same range.
And only in Canada's rarified range air (and only after 1945), eh!
We can, of course, hopefully think we can dream up some sort of excuse for how that somehow or other is how external ballistics works - again, only in Canada, and only after 1945.
Would like to see any pams for the rifle post 1945 and up to the 1980's version of Shoot To Live. I scoured the online pam library available over the DWAN while instructing at CFB Gag-Town, The Center Of Pestilence. Nothing discoverable going that route.
I suppose a FOIA directed at DND might uncover what the DWAN did not make available to the serving military. I'd like to see any of them, zeroing information or not.