In all fairness to everyone I may be having a senior moment here, But!
I've always understood parallax as the vision gained by viewing an object from two different angles?
A view through your scope should be free from distortion, shadowing, or graying out, ergo no parallax? or vision/scope fault?
A scope set to 35yds or 350yds shows clear focus, then these are found ranges by range finder?
If focussing your reticules requires a large adjustment then your range finder is now incorrect as the scope values have shifted?
These are corrected by pacing/measuring ranges and marking range finder accordingly?
I am more than happy to be shown the error of my ways,
Soon to be sixty five years stupid.