What @Proudkiwi said back in 2014 may be applied to $1000 scopes or otherwise:
"If you want to test a scope for click values you need to remove the scope from the rifle, clamp it in a way that it will not be able to move at all, ideally in a vice mounted on a concrete bench for example.
Then place a measured chart at exactly the correct distance (100mtr for mil turrets etc) and wind away observing your ret against the chart. "
https://www.nzhuntingandshooting.co....34/index3.html
The setup I pictured part-way down this page will identify % error throughout the range (and this can be factored into the dropchart if needs be), backlash, elevation-windage interactions, most of what you'd need to know to determine whether the scope being considered is up to par. The thing it won't tell you - though there might be some indication - is whether the behaviour seen will remain consistent over future usage and in different and perhaps more adverse conditions.
I would never "shoot a square" or a "tall target" test, sorry. I don't see any reason to superimpose my shooting error and that of my rifle needlessly onto an assessment of a telescopic sight.
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