If your zero is perfect at what ever zero you choose and your using a litz g7 bc.
Then it is just a matter of validating for speed and if your shooting over 500m you really want to be allowing for atmospherics as will make a difference in elevation.
There are some great videos out there.
I recommend accuracy 1st by Tod and Coby Hodnett.
Pretty much the be all and end all in long range knowledge.
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