I Shoot Mini-silhouettes..for Practice...
and when in competition, we have to sight in prior to the start, then we know where our scope setting are for the different distances. when we finish shooting at certain distance, we return to zero using our turrets which are adjusted by loosening the small allen screws and set to 0,0.
when we have to change from 40 meters to 60,77,100 and 150 meters we already know how many clicks there are between the various distances. at the end of the comp, I usually recheck my 0,0 and find that almost always is correct.(+/- 1 ).
I also own a 6.5-20X50 long range leupy (dot reticle) on my anschutz 1413 supermatch and find its amusingly precise.
on another anschutz model silhouette I have a 24 br leupy also with a dot reticle it always comes back to zero, and this scope has more than 15 years with me.. and has seen some abuse.
use the allen screws!