This, whilst I'm not on the level that some of you guys are, I do shoot deer for a living and by far the best way is to carry a wee rangefinder.
Better still is to walk around ranging all the 'deery' areas (if you hunt the same place consistently) and then you know immediately how far they are.
When out night shooting with a colleague they told me 'those deer are miles off!' when spying through a thermal, I flicked the lamp on and shot all three as I knew where they were and had shot from that point before.
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