Let us say that you have set up your three coloured rings at 200m, 300m and 400m. If you are using a range finder most of them will give you an EHR (equivalent horizontal range) reading. For example the Leica 1600, 2000 and 2700 can be set to give you an EHR reading.
So you range your animal which is up hill and it first gives you a true line of sight range in the view finder of say 327m then a couple of seconds later it shows the EHR reading of 303m. You would then dial up to your 300m mark on your BT and hold dead on. This was a simplified answer, obviously if the rangers were say true at 378m and EHR at 356m then you would have to calculate how many clicks above 300m you need to go to get to 356m.
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