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Rifles, Reloading, Optics, Equipment
Reloading
HELP WITH SATERLEE VELOCITY TEST
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<blockquote data-quote="entoptics" data-source="post: 1957459" data-attributes="member: 104268"><p>1) You say you don't have the expertise to evaluate the ladder/saterlee method, but believe it's real, but also don't seem to have the expertise to evaluate my method, but don't believe it's real...Interesting.</p><p></p><p></p><p></p><p>2) I didn't bias it. It is simply demonstrating the concept of normally distributed data. The whole reason we as shooters calculate and care about standard deviation.</p><p></p><p>If you aren't familiar with what Standard Deviation and normally distributed actually means, the simple version is a basic bell curve where...</p><p></p><p>68% of values will fall within ±1SD of the average</p><p>95% of values will fall within ± 2SD of the average</p><p>99.7% of values will fall within ± 3SD of the average</p><p></p><p>So, if you have ammo that has an average velocity of 2900 fps and an SD of 10 fps (quite good), and you fire 100 shots...</p><p></p><p>68 will be between 2890 and 2910</p><p>95 will be between 2880 and 2920</p><p>99 -100 will be between 2870 and 2930</p><p></p><p>I simply had excel randomly generate variation <strong>within the above limits</strong> based on a standard deviation of 10 fps, which in my opinion is pretty good for well made hand loads.</p><p></p><p><em>And just to be clear, the "nodes" circled in the 4 fake data sets <strong>are not actually nodes</strong> they are simply random noise, which appears to show a node. The same is almost certainly true of the OP's real data.</em></p><p></p><p></p><p>3) I have 10's of thousands of rounds down range, and while I wouldn't consider myself an expert, I have attempted OCW/Ladder/Saterlee type tests a few dozen times, and never had any repeatable success. It wasn't until I took the time to actually consider the statistics involved, that I realized why...</p><p></p><p>So, while maybe not an expert, <em>I <u>was</u> trying to help the OP reach his objective...</em></p></blockquote><p></p>
[QUOTE="entoptics, post: 1957459, member: 104268"] 1) You say you don't have the expertise to evaluate the ladder/saterlee method, but believe it's real, but also don't seem to have the expertise to evaluate my method, but don't believe it's real...Interesting. 2) I didn't bias it. It is simply demonstrating the concept of normally distributed data. The whole reason we as shooters calculate and care about standard deviation. If you aren't familiar with what Standard Deviation and normally distributed actually means, the simple version is a basic bell curve where... 68% of values will fall within ±1SD of the average 95% of values will fall within ± 2SD of the average 99.7% of values will fall within ± 3SD of the average So, if you have ammo that has an average velocity of 2900 fps and an SD of 10 fps (quite good), and you fire 100 shots... 68 will be between 2890 and 2910 95 will be between 2880 and 2920 99 -100 will be between 2870 and 2930 I simply had excel randomly generate variation [B]within the above limits[/B] based on a standard deviation of 10 fps, which in my opinion is pretty good for well made hand loads. [I]And just to be clear, the "nodes" circled in the 4 fake data sets [B]are not actually nodes[/B] they are simply random noise, which appears to show a node. The same is almost certainly true of the OP's real data.[/I] 3) I have 10's of thousands of rounds down range, and while I wouldn't consider myself an expert, I have attempted OCW/Ladder/Saterlee type tests a few dozen times, and never had any repeatable success. It wasn't until I took the time to actually consider the statistics involved, that I realized why... So, while maybe not an expert, [I]I [U]was[/U] trying to help the OP reach his objective...[/I] [/QUOTE]
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HELP WITH SATERLEE VELOCITY TEST
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