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Rifles, Reloading, Optics, Equipment
Rifles, Bullets, Barrels & Ballistics
7mm Allen Mag test rifle finished.....
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<blockquote data-quote="ricka0" data-source="post: 75283" data-attributes="member: 3086"><p>[ QUOTE ]</p><p> <font color="purple"> Ok If anyone can shoot a hole through this theory, I welcome that shot. </p><p>This is more or less an <strong> [sic] </strong> emperical process based on accurate barrel </p><p>life in several calibers as reported to me by lots of folks plus a </p><p>couple dozen barrels I've worn out. All I did was study the data and </p><p>determine what math would give a best-fit formula. And if someone has </p><p>a better method, I'd like to know what it is. </p><p> </font></p><p></p><p>[/ QUOTE ]</p><p></p><p></p><p>I have a MS in Applied math. Here is my review:</p><p></p><p>In scientific parlance, you don't have a theory - perhaps a conjecture. In colloquial terms, you can use theory.</p><p></p><p>&gt;&gt;All I did was study the data and determine what math would give a best-fit formula.</p><p></p><p>How did you measure best fit? I can easily get an exact fit to your data using splines or high order polynomials. Would a high order poly be a better predictor?; no - they oscillate wildly to fit thru each data point. How about a spline? Nope, splines can't be used to extrapolate data.</p><p></p><p>You have answered the problem yourself.</p><p></p><p>[ QUOTE ]</p><p> <font color="purple"></p><p>But this empirical formula has limits. The old .22 rimfire long rifle </p><p>burning 1 grain of powder in a bore whose capacity is 24 grains would </p><p>calculate to give a barrel life of some 1,728,000 rounds.</p><p> </font></p><p></p><p>[/ QUOTE ]</p><p></p><p>IE, you can't extrapolate.</p></blockquote><p></p>
[QUOTE="ricka0, post: 75283, member: 3086"] [ QUOTE ] <font color="purple"> Ok If anyone can shoot a hole through this theory, I welcome that shot. This is more or less an [b] [sic] [/b] emperical process based on accurate barrel life in several calibers as reported to me by lots of folks plus a couple dozen barrels I've worn out. All I did was study the data and determine what math would give a best-fit formula. And if someone has a better method, I'd like to know what it is. </font> [/ QUOTE ] I have a MS in Applied math. Here is my review: In scientific parlance, you don't have a theory - perhaps a conjecture. In colloquial terms, you can use theory. >>All I did was study the data and determine what math would give a best-fit formula. How did you measure best fit? I can easily get an exact fit to your data using splines or high order polynomials. Would a high order poly be a better predictor?; no - they oscillate wildly to fit thru each data point. How about a spline? Nope, splines can't be used to extrapolate data. You have answered the problem yourself. [ QUOTE ] <font color="purple"> But this empirical formula has limits. The old .22 rimfire long rifle burning 1 grain of powder in a bore whose capacity is 24 grains would calculate to give a barrel life of some 1,728,000 rounds. </font> [/ QUOTE ] IE, you can't extrapolate. [/QUOTE]
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7mm Allen Mag test rifle finished.....
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