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 Post subject: Corrected pressure in JBM trajectory software
PostPosted: Mon Feb 12, 2018 10:09 pm 
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Joined: Wed Feb 06, 2013 10:31 pm
Posts: 215
I am confused as to check or uncheck the pressure corrected (or absolute) box when using Bryan Lits trajectory software.

It makes a huge difference at 1000 yards (3 MOA).

I check local weather data before shooting at long range. Temperature, humidity, altitude.

Is weather service data corrected or absolute?


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 Post subject: Re: Corrected pressure in JBM trajectory software
PostPosted: Fri Feb 16, 2018 5:56 pm 

Joined: Mon Oct 17, 2011 10:43 pm
Posts: 652
Location: CO
andrewctillman wrote:
I am confused as to check or uncheck the pressure corrected (or absolute) box when using Bryan Lits trajectory software.

It makes a huge difference at 1000 yards (3 MOA).

I check local weather data before shooting at long range. Temperature, humidity, altitude.

Is weather service data corrected or absolute?


The pressure reported by weather stations is corrected pressure, so you will need to input the altitude of where the weather station is into the calculator.

Absolute pressure is what you would get from a Kestrel, when you use absolute pressure there is no need to input the altitude in the ballistic calculator, you leave it set to 0.


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