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Rifles, Reloading, Optics, Equipment
Rifles, Bullets, Barrels & Ballistics
Calculating BC with LabRadar. It works!
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<blockquote data-quote="ptosis" data-source="post: 2030310" data-attributes="member: 116258"><p>There may be a confusion stemming from Kestrel's "creative" terminology.</p><p></p><p>There are two types of pressure measures (actual barometers can sometimes show both).</p><p></p><p>One is the actual pressure measured by the sensor at the location -- usually called "station" or "absolute" pressure -- this is what we need (because this is what defines air density at the shooting spot).</p><p></p><p>The other is "sea level" pressure. This is a calculated value, basically meaning "what would the pressure have been, if we were at altitude zero / sea level". If you actually are at sea level, station pressure and sea level pressure are the same. If you are at a certain altitude, your effective / station pressure is always lower than at the sea level, but if you know the exact altitude, you can calculate the "would be sea level" figure.</p><p></p><p>This second "sea level" pressure value is used in meteorology to compare measures of air pressure in different regions / altitudes. It is, however, totally useless for shooting. Bullets only "care" about what's happening at the shooting location.</p><p></p><p>The problem with Kestrel "creative" terminology is that they are using the term "barometric" (measured with a barometer) to designate the sea level calculated values (and not what is actually measured by the sensors).</p><p></p><p>The pressure figure that you have posted in the picture, if I correctly read the over-the-pond units, corresponds to station/absolute pressure in Colorado Springs.</p><p></p><p>(Sorry if all this stuff sounded obvious to you.)</p></blockquote><p></p>
[QUOTE="ptosis, post: 2030310, member: 116258"] There may be a confusion stemming from Kestrel's "creative" terminology. There are two types of pressure measures (actual barometers can sometimes show both). One is the actual pressure measured by the sensor at the location -- usually called "station" or "absolute" pressure -- this is what we need (because this is what defines air density at the shooting spot). The other is "sea level" pressure. This is a calculated value, basically meaning "what would the pressure have been, if we were at altitude zero / sea level". If you actually are at sea level, station pressure and sea level pressure are the same. If you are at a certain altitude, your effective / station pressure is always lower than at the sea level, but if you know the exact altitude, you can calculate the "would be sea level" figure. This second "sea level" pressure value is used in meteorology to compare measures of air pressure in different regions / altitudes. It is, however, totally useless for shooting. Bullets only "care" about what's happening at the shooting location. The problem with Kestrel "creative" terminology is that they are using the term "barometric" (measured with a barometer) to designate the sea level calculated values (and not what is actually measured by the sensors). The pressure figure that you have posted in the picture, if I correctly read the over-the-pond units, corresponds to station/absolute pressure in Colorado Springs. (Sorry if all this stuff sounded obvious to you.) [/QUOTE]
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Calculating BC with LabRadar. It works!
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