Environmental BC Adjustment
  
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Here you can adjust for the current or anticipated weather conditions.
This data will adjust the BC value for those specific conditions.
You may for example be hunting out west where you could be at different elevations. This will mean shooting in zones with differing Barometric Pressures.

If you can not get the data for pressure, you can use the Pressure by Altitude button to get a calculated standard pressure for that altitude.

            The window comes up with The Standard Temperatures and Pressures for the average load.
            

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