I'm unsure if their EHR is still the same in the newer models, but this thread link is an interesting read. Leica doesn't just use a basic angle calculation. It takes into account pressure and temperature as well. Hard for me to explain but have a read.
https://www.longrangehunting.com/thr...-1600b.150425/
You also had to match up a ballistic curve model that was in the manual to use EHR function
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