I have a Gen 1 PST 6-24x50IR FFP and based upon the optical quality feel it is a 500 yard scope. When I bought it I paid $750. Apparently the same model is down to $500 now.
I’m looking at a Leupold Mk5 ($2300) or Nightforce ($2000) as a replacement if I ever get interested in this again.
However, the lure of shooting past 400 yards faded quickly for me (my range goes out to 500). Too much cost to be serious and too little opportunity ROI.
I have 20/15 distance vision.