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Rifles, Reloading, Optics, Equipment
Reloading
Getting ES and SD down to single digits
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<blockquote data-quote="QuietTexan" data-source="post: 2415705" data-attributes="member: 116181"><p>I didn't ever see where you posted how many shots in the groups you were using to quantify SD and ES. There's a range of 5-10 shots that should minimize SD while stopping soon enough to keep ES from blowing up. That's where a lot of single-single statistical groups come from. Even the best-per-Litz 5fps SD loads will ultimately end up with double digit extreme spreads if you shoot enough of them. And conversely if you happen to shoot the two worst loads as your first two shots your SD can spike early. Or drop unreasonably low if you shoot two good ones.</p><p></p><p>So 5-10 shots per string for record if you want a single-single. Or all the shots if you want the truth.</p><p></p><p>[ATTACH=full]333734[/ATTACH]</p><p></p><p>The bit on the Engleman study in the source link below of creating sub-strings from one large 50-shot string and how the statistics are skewed inside a data set is very interesting, and a big reason why you should judge statistics against the target, and lean towards the target being more correct. Single digit ES is very unlikely in a high-confidence single digit SD data set, so don't let that crazy level of perfection be an impossible goal that stops you being happy with merely good statistics that result in great targets.</p><p></p><p>Source:</p><p>[URL unfurl="true"]https://precisionrifleblog.com/2020/12/05/muzzle-velocity-statistics-for-shooters/[/URL]</p></blockquote><p></p>
[QUOTE="QuietTexan, post: 2415705, member: 116181"] I didn't ever see where you posted how many shots in the groups you were using to quantify SD and ES. There's a range of 5-10 shots that should minimize SD while stopping soon enough to keep ES from blowing up. That's where a lot of single-single statistical groups come from. Even the best-per-Litz 5fps SD loads will ultimately end up with double digit extreme spreads if you shoot enough of them. And conversely if you happen to shoot the two worst loads as your first two shots your SD can spike early. Or drop unreasonably low if you shoot two good ones. So 5-10 shots per string for record if you want a single-single. Or all the shots if you want the truth. [ATTACH type="full" alt="1642964921329.png"]333734[/ATTACH] The bit on the Engleman study in the source link below of creating sub-strings from one large 50-shot string and how the statistics are skewed inside a data set is very interesting, and a big reason why you should judge statistics against the target, and lean towards the target being more correct. Single digit ES is very unlikely in a high-confidence single digit SD data set, so don't let that crazy level of perfection be an impossible goal that stops you being happy with merely good statistics that result in great targets. Source: [URL unfurl="true"]https://precisionrifleblog.com/2020/12/05/muzzle-velocity-statistics-for-shooters/[/URL] [/QUOTE]
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Reloading
Getting ES and SD down to single digits
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