Hello Øyvind
first I think Kenny is complete right you'll learn much more by practice.
Chairgun is a interesting tool for the long and dark winter in summer imo its better to enjoy the rifle.
To your prob. first enter the mag. of your scope (15x ) in the main-mask.
Then open the scope-calibration. Dot-settings > increment 1,5 cm > enter > range 15 m > enter > use this- button. Than it should work.
Jochen
A long way from Edinburgh to Haugesund for a helping hand
PS Øyvind you're right mil-space in MOA is wrong I've never looked at but the POI on the reticule compares exact to what I've tested meter by meter.