There is "station" pressure - the actual air pressure in the measurement location, unadjusted for altitude. If you have a Kestrel Pocket Weather Meter, you would leave the altitude at zero.
"Barometric" pressure is air pressure adjusted for altitude by a fairly simple formula. This is what weather reports usually use. With the Kestrel Pocket Weather Meter, you would enter the actual altitude.
So if you have a number for pressure, is it Station, or adjusted to sea level? And what does your ballistics program use? If the program has an "Altitude" box, it is Barometric, adjusted to sea level.
If the program has no altitude box, it is Station pressure.
Convert "weather report" pressure (corrected to sea level) to station pressure.
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