Not just some blokes theory, Bigfella, ask any F-class, Silhouette, Field Rifle shooter or an air rifle Field Target shooter that are at the top level of their game, these disciplines require accurate repeatable turret adjustments so they have a zero at every yardage, you need to trust your scope. I have had early model Tasco's fail, a Simmons Gold Medal varmint which are no longer available wear out its turrets and does not hold zero, recently sent back a Leupold that had done a lot of work and have seen many scopes fail during comps. I would not call it running in as such but it does pay to wind the elevation/windage turrets to their extremes, ensures everything is operating as intended, then centre them before sighting in and as I stated earlier when adjusting wind the turrets past where you want and wind back whether that be left/right or up/down
Adding to the argument about cheap scopes, I recently had to retire my 30yr old Nikko 6x40, when my 12yr old son reckons it was getting a bit blurry ( his eyes are way better than mine
) I knew it was time to let it go, bugger, but I do have another Nikko that I will not be replacing any time soon, I don't really care where the glass in it is made, it is doing the job required very well on a hunting rifle
