do you have a rangefinder?
yes its the best to run it over a chroni, theres a forum chroni if you cant russle one up locally
these last few steps take all of a few minutes to do and really take all the guestimation out of things
320m depending where you zero may be easy enough to guestimate based on shoulder shooting and using the back bone as a reference, till you are up and going with all the data youll need to do a drop chart
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