Any kind of bullet drop compensation that's based on guess work is hopeless.
all inputs need to be correct in order for you to get any kind of workable drop chart.
Knowing how fast the given projectiles are going is very important.
If you can't get hold of a chrono re-write your chart in the field based on actual drop and Click value required at given ranges.
This will take some considerable time and precision shooting but it does take away the effect of any variables you may have in your set up.
Cheers.
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