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I’ve found myself needing to reference this info a lot while making data cards. It indicates the standard atmospheric pressure at different elevations. Pressure can vary quite a bit from the “standard” listed here, and although that won’t make much of a difference at short or mid ranges … when you get out to 1,000 yards or beyond it can make a noticeable difference. If you know the specific pressure the day you are shooting, it could really help your ballistics tables be more accurate. Having a Kestrel that can measure the instantaneous pressure is the best solution.
| Altitude (ft) | Pressure (inHg) |
|---|---|
| 0 (Sea Level) | 29.92 |
| 1,000 | 29.86 |
| 2,000 | 27.82 |
| 3,000 | 26.82 |
| 4,000 | 25.84 |
| 5,000 | 24.90 |
| 6,000 | 23.98 |
| 7,000 | 23.09 |
| 8,000 | 22.23 |
| 9,000 | 21.39 |
| 10,000 | 20.58 |
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