With MILDOT 10 and a rifles scope with a mil dot reticle, you have access to the most accurate means to manually estimate range. Use it for precision shooting and all of your gun or other range-estimating needs.
There is no need to decide your units, metric or imperial, in advance. All of the fields are up at once, so just enter them as needed.
This is a utility and not a game.
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Also see my other apps:
BulletFlight M
BulletFlight L1
BulletFlight L2
GunSounds
HandgunSounds
BulletTwist