If you have a reliable scope, that can be trusted with it's dialing, you can use one scope and just dial when swapping loads.
Zero the rifle with your predominant load (in my case, big game hunting loads), confirm dial dope for secondary load, note and tape to your stock / scope / etc.
I do this very frequently when practicing or shooting pests with reduced loads and cast loads.
This is your answer, I have 4 rifles that share 2 Nightforce NX8 2.5-20x50mm scopes. Murphy Precision rails on all 4 rifles and I use Nightforce Ultra Lite rings for both scopes. Zero on the primary rifles, set the Zero Stop, install on secondary rifles, zero, make note of setting, reinstall on primary and crank back to zero. I have yet to have to re-zero either rifle.
Much easier now that I have a dedicated torque wrench for those rings/scopes/rifles.
I thought it was complicated listening to it be explained, but in reality it is quite simple.
