Thread: Barometric pressures at altitude

Ok. I didnt use it at 2k and worked out ok. other apps/solutions also do it. Doesn't mean you need it.

Originally Posted by blair993

Ok. I didnt use it at 2k and worked out ok. other apps/solutions also do it. Doesn't mean you need it.

Spin drift yes you can turn it of as your wind call is more important than spin drift but as AJ effects elevation that should be used in your calculations.
As for coriolis I havnt got the brain power to work that out with out my kestrel.
It's very simple for the kestrel as it has the latitude put in and the compass with DOF input.
I like using all the fruit as then I am familiar with it when I need it.
Different strokes I reckon

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Hi here are the air pressure over the range of altitudes we are likely to shoot in NZ.
These are from the Casio Web Calculator which Puffin kindly showed in his post.
I've set the sea level pressure to 1013 hPA (it can vary from about 980 to 1030 depending on the weather system on the day).
I've set the temp to 10C but of course this generally falls about 10C per 1000m and you can put this into the calculator and see if it makes a difference for you.



I think next time I do this I'll note what the sea level pressure was at the time.
However, it looks as if the web calculator gives close enough values for my purpose, which is making up a drop table so I don't have to refer to a barometer for each shot. Undoubtedly, the best way to get an accurate adjustment for a shot longer than 500m is to measure the pressure where you're shooting and put that into a ballistic calculator at the time.