IMO, non-linear variations is turret resistance should be checked out, particularly for high demand long range use. I have owned three scopes(two Leupold Mk4's, and a Vortex AMG) over the years that ultimately failed after initially exhibiting this effect. In some cases it may be due to incorrect turret tightening following removal/replacement after zero stop adjustments. I have seen this with some NF scopes where the turret made contact with the scope body when unevenly mounted, but corrected when properly re-set. On a new scope, this may be due to lubricant settling and will dissapear with a few full-range turret cycles. I would certainly do a tall test, "and" contact the manufacturer to inquire of the uneven resistance to get their explanation of this effect. I would not expect this from a premium scope.
