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Rifles, Reloading, Optics, Equipment
Rifles, Bullets, Barrels & Ballistics
Altitude vs. Barometric pressure
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<blockquote data-quote="Michael Eichele" data-source="post: 74090" data-attributes="member: 1007"><p>Mike CR,</p><p></p><p>You are correct once again in that "if the pressure is differant on a given day." </p><p></p><p>Think of it this way. If a user is entering altitude it is because he has no way to measure pressure. If he has a way to figure pressure accuratly, he would want to use the pressure option instead of the altitude. Like was stated in earlier posts if the pressure is known then you would enter 0' in the altitude field on those programs that allow you to use both. </p><p></p><p>This program enters 0' in the altitude field for you if you opt to use pressure. That way you cant accidentaly enter both.</p><p></p><p>I know several RSI users that dont measure pressure. When they use the program they enter altitude and RSI defaults pressure to the standard at that altitude. Thats all mine does. If in the RSI program, and altitude and pressure are both entered, and the pressure at your location is 24.95 at an altitude of 5000' and 59 deg. you get slightly inaccurate but close numbers. If 0' is entered and the correct pressure is entered, then it will give you correct ballistics. My program automaticly issues 0' when pressure is used.</p><p></p><p>It is of course MOST accurate to use the pressure, but if the pressure is not known, altitude can be used and will be VERY close most of the time. The BARNES X program doesnt even give you the option to use pressure. Only altitude.</p><p></p><p>In short, if you know the pressure is 27.54 at you location it does not matter what the altitude is. Its raw pressure. You simply enter enter into the pressure field 27.54 at that point altitude is defaulted to 0' so as to not create inaccuracies in the ballistics and it will generate to you ballistics the same way as RSI, JBM, ect...</p><p></p><p>Please keep them coming!! I am getting alot out of this.</p></blockquote><p></p>
[QUOTE="Michael Eichele, post: 74090, member: 1007"] Mike CR, You are correct once again in that "if the pressure is differant on a given day." Think of it this way. If a user is entering altitude it is because he has no way to measure pressure. If he has a way to figure pressure accuratly, he would want to use the pressure option instead of the altitude. Like was stated in earlier posts if the pressure is known then you would enter 0' in the altitude field on those programs that allow you to use both. This program enters 0' in the altitude field for you if you opt to use pressure. That way you cant accidentaly enter both. I know several RSI users that dont measure pressure. When they use the program they enter altitude and RSI defaults pressure to the standard at that altitude. Thats all mine does. If in the RSI program, and altitude and pressure are both entered, and the pressure at your location is 24.95 at an altitude of 5000' and 59 deg. you get slightly inaccurate but close numbers. If 0' is entered and the correct pressure is entered, then it will give you correct ballistics. My program automaticly issues 0' when pressure is used. It is of course MOST accurate to use the pressure, but if the pressure is not known, altitude can be used and will be VERY close most of the time. The BARNES X program doesnt even give you the option to use pressure. Only altitude. In short, if you know the pressure is 27.54 at you location it does not matter what the altitude is. Its raw pressure. You simply enter enter into the pressure field 27.54 at that point altitude is defaulted to 0' so as to not create inaccuracies in the ballistics and it will generate to you ballistics the same way as RSI, JBM, ect... Please keep them coming!! I am getting alot out of this. [/QUOTE]
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Rifles, Reloading, Optics, Equipment
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Altitude vs. Barometric pressure
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