I just did the mirror method with two scopes, both of which I had already counted total clicks, then came back half way.
Both were 6 clicks or less, in both directions.
So, thinking out loud, if a scope is off center by 1.5" at the objective lens, does anyone know what that translates to at 100 yards? I'm thinking that simple trigonometry applies here, but I am not sure, as I am not totally sure about the internals of scopes, especially, brand to brand.
Also, does 4" off of the bullseye, at 50 yards, translate to 8" at 100 yards? I'm pretty sure the answer is yes, based on trig, but I want to have all of my ducks in a row, as I troubleshoot a possible drill and tap issue, which I first was told, was a scope issue. My newly acquired cartridge bore sighter, will hopefully help resolve things.
Happy New Year!!