On your4 new mildot vortex you should reach 600 yards by just milling, find out where it ranges at, since it just 20 power it could range there if not might be at 16
Formula=Calibrating range power( /) divided by operating power, Times ( x) line or Gap value=value at various power settings
I made a calcultor to do this excel spreadsheet, I got the formula from nightforce, example if your scope ranges at 20x then at 600 yards your mill value would be 21.6 inches for 1 mill,
if it ranges at 16 power and you set it on 20 power then it would be 17.28 inch per one mil at 600 yards
So lets just say your bullet drops 80 inches at 6oo yards from sight in at 100 and your scope ranges at 20 power then you would hold over about4 mil , 4x 21.6=86.4
Formula=Calibrating range power( /) divided by operating power, Times ( x) line or Gap value=value at various power settings
I made a calcultor to do this excel spreadsheet, I got the formula from nightforce, example if your scope ranges at 20x then at 600 yards your mill value would be 21.6 inches for 1 mill,
if it ranges at 16 power and you set it on 20 power then it would be 17.28 inch per one mil at 600 yards
So lets just say your bullet drops 80 inches at 6oo yards from sight in at 100 and your scope ranges at 20 power then you would hold over about4 mil , 4x 21.6=86.4