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Rifles, Reloading, Optics, Equipment
Rifles, Bullets, Barrels & Ballistics
Ballistic programs that dont agree
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<blockquote data-quote="BallisticsGuy" data-source="post: 1720710" data-attributes="member: 96226"><p>Being as I publish my own, I have some expertise here. Calculators implement the mathematics in different ways, many use different mathematical models and then you've got little switches/toggles/dials in the app itself which are not always totally clear to the layman as to their effect or their correct usage. When I built mine I used an existing app that had a critical bug in it (which I fixed) as the foundation but then I tweaked the way that the mathematics was implemented and exposed some additional inputs to give results that I feel are more precise WHEN USED CORRECTLY. In order to validate my calculator's numbers I compared hundreds of input sets across a great gooey gob of different calculators which all supported G1 BC's. What I noticed was, excluding my own, there was a normal variance of .5MOA across the set of calculator apps that I was comparing. So, that gave me a basis by which to compare my own calculator to the others. When the inter-app variance between mine and the others I tested against was within roughly .5moa then I was reasonably sure that I hadn't made any critical errors and the results could be useful.</p><p></p><p>Newer calculators like 4dof have come out since I published mine and there is some not small disagreement between it and other apps. I haven't tested much against 4dof but some of my shooting buddies do use it to build their dope cards for our matches and they seem to get very good results with it and the ELD series of bullets.</p></blockquote><p></p>
[QUOTE="BallisticsGuy, post: 1720710, member: 96226"] Being as I publish my own, I have some expertise here. Calculators implement the mathematics in different ways, many use different mathematical models and then you've got little switches/toggles/dials in the app itself which are not always totally clear to the layman as to their effect or their correct usage. When I built mine I used an existing app that had a critical bug in it (which I fixed) as the foundation but then I tweaked the way that the mathematics was implemented and exposed some additional inputs to give results that I feel are more precise WHEN USED CORRECTLY. In order to validate my calculator's numbers I compared hundreds of input sets across a great gooey gob of different calculators which all supported G1 BC's. What I noticed was, excluding my own, there was a normal variance of .5MOA across the set of calculator apps that I was comparing. So, that gave me a basis by which to compare my own calculator to the others. When the inter-app variance between mine and the others I tested against was within roughly .5moa then I was reasonably sure that I hadn't made any critical errors and the results could be useful. Newer calculators like 4dof have come out since I published mine and there is some not small disagreement between it and other apps. I haven't tested much against 4dof but some of my shooting buddies do use it to build their dope cards for our matches and they seem to get very good results with it and the ELD series of bullets. [/QUOTE]
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Rifles, Reloading, Optics, Equipment
Rifles, Bullets, Barrels & Ballistics
Ballistic programs that dont agree
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