I do a lot of my testing at sea level, but so far, all of my long range airgun competitions have been at around 2000ft elevation. That alone changes the barometric pressure that I need to account for. I calculate the drops based on conditions when shooting because there can be significant differences. Drop varies with conditions.
Yep.
I use Density Altitude/DA which is a calculation using a combo of, station pressure, altitude, and humidity. I get that info from my Kestrel weather meter.
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