With the better units in our test, we were able to repeatably laze pickup trucks at 1200 yards or beyond. But the stuffed bushbuck (about size of a small doe), with its torso about 40" high was a total fail much past 800. At long range yes you will get a return (on larger, more reflective targets), but you need to study the specs of beam divergence very carefully. You may not be getting a return on what you think you are aiming at.
"Man-sized target ranging at 2000+ yards" -- sounds intriguing...
A man-sized object is maybe two feet wide (24") at waist. At 2000 yards, that's slightly more than one MOA. Now read your LRF manual -- what angular measurement does the visible aiming dot in your LRF cover. I bet it's a lot more than 1 MOA!
I'm not contesting that you may get a return from that distance -- but from what, is the question. If your aiming dot is 3-5 MOA... what are you really putting the dot on at 2K?
And is the aiming dot you see perfectly centered with the laser beam? (Hint, maybe not.)
In past few years Leica and Zeiss have made significant progress in error correction and holding tighter beam divergence, but you still have regulatory limits on
beam strength (laser output power).
FWIW, Leica lists the Beam Divergence of its latest, high-end CRF-2700B as "approx. 0.5 x 1.2 mrad". That is significantly better than most.
Link:
https://us.leica-camera.com/Sport-Optics/Leica-Hunting/Rangefinders/Leica-Rangemaster/Range
But consider that 1 MRAD equals 3.44 MOA, so 1.2 MRAD equals 4.128 MOA. That means, at 2000 yards, your max beam divergence, under perfect conditions, is 86.4 inches (4.128 x 1.047 x 20).
Again, with a perfect hold you may get a return... but are you really ranging a man, or the rock 7 feet away?
Then add the 3-5 MOA "spread" just from the size of the aiming dot.
And we haven't even talked about mirage at 2K.
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Having said all this I HAVE used a modern LRF to confirm a target at approximately 2085 yards. But I wasn't ranging the 36"x36" steel plate we were shooting at. I was ranging a water tank 50 yards laterally to the left. Big targets at 2000 yards are definitely doable.