I got a kestrel meter mostly to help me build a better read on the wind ...
But what I have noticed on ranges that have 600 - 1k yards on them with different flags out there - the frigg'n wind changes a lot...
If you can't shoot during the same wind, your POI moves a good deal at 1000 yards.
that kind of makes me wonder how much of a benefit using a Ballistic calculator is ...
Learn to read the wind boys....
