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Rifles, Reloading, Optics, Equipment
Rifles, Bullets, Barrels & Ballistics
Applied Ballistics Mobile App
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<blockquote data-quote="DocUSMCRetired" data-source="post: 1046911" data-attributes="member: 85458"><p>A question that has come up more than once now, I think its a good time to share the answer.</p><p></p><p>Their are two standards for atmosphere when measuring a BC. Some companies use ASM, and other companies use ICAO.</p><p></p><p>Their are also these same two standards in Ballistics Software. Some solvers are using ASM, some are using ICAO. However we have given you the option to use either.</p><p></p><p>Army Standard Metro Conditions - 29.53 inHg, 59 Deg F, and 78% Humidity.</p><p>International Civil Aviation Organization - 29.92 inHg, 59 deg F, 0% Humidity.</p><p></p><p>If you have the book Applied Ballistics for Long Range Shooting this is addressed on page 117.</p><p></p><p>Some of the older solvers are only designed to work with ASM, some of the newer solvers are only designed to work with ICAO. This means that you could have an error of 2% in your solution. </p><p></p><p>Berger ICAO</p><p>Barnes ICAO</p><p>Hornady ASM</p><p>Nosler ICAO</p><p>Lapua ICAO</p><p>Sierra ASM</p><p>Winchester ASM</p><p>GI APG ICAO</p><p></p><p>Luckily our app allows you to tell it which standard was used. If you use the information found in the book Ballistic Performance of Rifle Bullets, then its ICAO. If you use our Custom Drag Models then you don't have to worry about this at all.</p><p></p><p>If I get any other information or if something changes in regards to what models the companies above use, I will update this information. This might not apply to all shooters, but it is there if you need it.</p></blockquote><p></p>
[QUOTE="DocUSMCRetired, post: 1046911, member: 85458"] A question that has come up more than once now, I think its a good time to share the answer. Their are two standards for atmosphere when measuring a BC. Some companies use ASM, and other companies use ICAO. Their are also these same two standards in Ballistics Software. Some solvers are using ASM, some are using ICAO. However we have given you the option to use either. Army Standard Metro Conditions - 29.53 inHg, 59 Deg F, and 78% Humidity. International Civil Aviation Organization - 29.92 inHg, 59 deg F, 0% Humidity. If you have the book Applied Ballistics for Long Range Shooting this is addressed on page 117. Some of the older solvers are only designed to work with ASM, some of the newer solvers are only designed to work with ICAO. This means that you could have an error of 2% in your solution. Berger ICAO Barnes ICAO Hornady ASM Nosler ICAO Lapua ICAO Sierra ASM Winchester ASM GI APG ICAO Luckily our app allows you to tell it which standard was used. If you use the information found in the book Ballistic Performance of Rifle Bullets, then its ICAO. If you use our Custom Drag Models then you don't have to worry about this at all. If I get any other information or if something changes in regards to what models the companies above use, I will update this information. This might not apply to all shooters, but it is there if you need it. [/QUOTE]
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Applied Ballistics Mobile App
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