Regarding
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Fixed is not necessarily better than a variable scope. Fixed has fewer moving parts to eventually break, and is cheaper to build a reliable scope.
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Mount any variable scope on an optical collimator then change the power back and forth while the reticle moves about the reference in the letter C, S or figure 8 patterns the scope reticle makes because of mechanical tolerances in lens mounts. One to two thirds MOA error is common.
This is also the best way to "box" a scope because it eliminates rifle, ammo and human variables. Box it using 2 clicks each direction and you'll be surprised.