I have had several range finders. I found they MAY be good at half their advertised range. My Leo RX 1000 is good, but you are lucky to get half. I have ranged as high nearly 900 in the mountains in cool cloudy weather.
But on the prairie, in bright sunlight Im lucky to range an antelope at 300 yards.
I started a search for a range finder that would suit my needs, a real range finder.
I was at a PR Match and we were talking about this subject. One guy got out his Vectronix Terrapin which I started playing with and did range a huge rock at 3400 yards. I was impress. That was for me. 2 grand, but I don't mind paying for something that works.
Except when I got ready to buy, they stopped making them.
I was on a bear hunt and the guide showed me his Gunwerks G7-BR2. It easily got from 1500-2000 yards. Again pricy, $1600, but it works.
I bought one, and IT DOES WORK. Frist thing I did was range a cow in sunlight at 1673 yards.
The g7-BR2 advertises 2000 yards for ranging only, and 1400 yards when using the BC program. I so far have found that to be honest for the range only claim, I haven't tried the BC ranging yet.
Now I need to program it. It has an internal BC program that takes in the info of your ammo BC, computes angle, temp, humidity, an altitude and gives you a corrected range. Tells you how much MOA you need for correction.
Also has windage correction. You give it the est wind to the nearest 5mph and it will give you the correction needed.
I personally think for what it does, $1600 is cheap.
In range finders like most everything else you get what you pay for.