Here it is:
The farthest lecture he could get on a 24X24 steel gong was at 1400M.
Some lecture on very big and reflective ROAD SIGNS where possible up to 3200M and less.
But very few lectures past 1400M on NON reflective targets.
Reticule is big apparently.
Cheers.
P.S. I did not try it myself. So I can`t comment on this guy review but he is a very credible and experienced shooter.