I think you'll find that the listed range for every single rangefinder on the market is pretty much wishful thinking. As I'm sure you know there are two types of target for ranging - reflective and non-reflective. Most companies will use a very generously estimated reflective figure in all of their marketing mumbo-jumbo as that's the figure everyone looks at when it comes to deciding on a range finder. However, it's the non-reflective specification that's most important as that's a much better gauge of it's ranging capability in the real world on real objects/targets.
That said, your best bet is to look for one advertised to have a range nearly double that of what you really need it for. For example, if you regularly take shots out to 600 yards then you'd want a rangefinder with a claimed rating of 1200 yards or better. Also, at those ranges you'll probably want one with 6x or higher magnification which will allow you to better aim the laser for more accurate ranging. You'd be surprised how easy it is to miss the broad side of a barn with a tiny little laser beam from 1,000 yards away when you only have zero or 2x magnification.
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