So define centering your scope. At this stage I think your video and thoughts are....well...bs.
^x2 .... I also use this method to insure I'm roughly centered.... Then I zero using the turrets as I have not noticed a problem doing that....There are 2 critical things on mounting a scope however.... Make sure that the vertical crosshair intersects the center of the barrel or you will end up with a cant error.... If you are shooting a mostly long range, use a mount or ring shims (such as the Hawke) to add about 25 MOA of elevation to put you closer to optical zero at 100 yards....Bending the barrel is a good option for springers, not so useful on many PCPs....Bob
Just for a little monkey wrench. WWII Garand sniper rifle! Yes, the scope is offset. Many WWII sniper rifles of different armies were offset to accommodate loading.
I don't believe that to be the case.... See example "F" in the first diagram above.... More than likely the rifle was sighted for the most common target range, eg. 600 yards.... That would cause only an additional 1" to the left at 1200 yards.... Airguns are particularly picky with the vertical crosshair does not line up with the bore, because we tend to sight them in at such close ranges.... Bob