The stadiametric scale in the PSO-1 scope is hideously innaccurate. This is likely due to the scale being drawn to a different scale as the characters in game, or due to the foreshortening of characters prematurely.
When a person is approximately 200m away from the scope, they fit somewhere between the 400m-500m part of the stadiametric scale.
Also, the reticule and stadiametric scale are difficult to see, they need to be made clearer.
Every PSO-1 scope...
Nah you got it wrong. Since the PSO-1 is just a 2D overlay sight (like long range) opposing 3D scope (like ACOG), this value printed on the scope depends on your FOV. For this values to be correct, you have to be in a certain FOV depending on your resolution. For 1920x1080 set your FOV slider to the middle of the "e" and "i" in field and you should be good. It could also depend on the UI size, so try to find your correct value with a friend on a wall to mesure ranges.
How to fix this? 2 ways :
And no, it's not done yet 'cause they have much more useful work to do first... like implementing Makarov and AK101 :)