The leupy 1200tbr has a whole heap of preset ballistic curves programmed into it and you choose the one that best suits your load, as stated, it's not perfect especially once you start stretching its legs but it's the kind of gimicky thing that Americans lap up. I use mine without a load loaded into it and get my information from strelok as I'm not keen on shooting out front legs.
As a point of interest there seems to be good ones and bad ones of this model rangefinder, I have no trouble ranging 1200 and have had it range out past 1400 several times.
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