Great video - really informative. I have a question: why do we want to get our scopes optically zeroed?
I have a specific reason for asking. I'm currently zeroed at 55 yds, at approximately middle range of elevation turret, but would like to go to 100 yds and back to 50 repeatedly for target shooting. With current zero, I need to click up > 12 MOA, substantially lowering tension on the elevator spring. Would it be better to try and get the scope zero at 50 yards set at maybe 2 turns down below middle of range (using FX 'no limit' rings), so that when I click up to 100 yds, the elevator turret spring is still under good tension? I'm using an Optisan Genesis 5-20x50.
Look forwards to learning more.