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Rifles, Reloading, Optics, Equipment
Reloading
SD/ES question
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<blockquote data-quote="QuietTexan" data-source="post: 2728285" data-attributes="member: 116181"><p>Before I say anything more - this is just math, and the OP has never mentioned shooting at a distance far enough for ES/SD to matter much if at all. If he stays 500 yards or in the ES/SD basically don't matter <em>at all </em>and he'll gain significantly more improvement through range and wind call improvement on any given shot than changing up a load that prints decently. Muzzle velocity statistics and BC % variation are long-range (1200+ yard) topics, inside that range I agree that pretty much all that matters is the group size because that wraps up all the p[possible variables in a final result.</p><p></p><p>I use ATC instead of max spread for group size because it's more useful in layering results of multiple short strings, especially for something like a 300 RUM where if you care about the barrel you don't want to send 30 in a row down it without letting it cool down.</p><p></p><p></p><p>That said, here's some math that doesn't really matter:</p><p></p><p>Yes I agree that a 30FPS ES would be great..... the issue is that for <em>all future shots</em> that his ES isn't really 31FPS, just like how in the 3-shot single digit ES/SDs that get posted the ES isn't really 1-9FPS.</p><p></p><p>The ES of his very few shots were 31fps, but the inference to be made from the small sample is that the ES of any future group of 5 shots will be ~75-100 FPS (5-6x SD around the mean velocity) - if he shoots enough of them he'll eventually get a huge ES.</p><p></p><p>Cal Zandt documented an SD 5.5/ ES 2 over 36 shots on a Lab Radar in one of his articles. That is an exceptional load because the ES is ~5x of SD, so the sample has already started to show normalization at the extreme ends. If the population has SD bands that matched a normal curve then he'd found a load that shows the type of consistency that will shoot well at long-range. Considering I think that was the 300 Norma he won the NF Steel Challenge with, that rifle worked out very well for him. But that was also shot at a distance where muzzle velocity stats mattered, not at or under 1000 yards.</p><p>[URL unfurl="true"]https://precisionrifleblog.com/2020/12/05/muzzle-velocity-statistics-for-shooters/[/URL]</p></blockquote><p></p>
[QUOTE="QuietTexan, post: 2728285, member: 116181"] Before I say anything more - this is just math, and the OP has never mentioned shooting at a distance far enough for ES/SD to matter much if at all. If he stays 500 yards or in the ES/SD basically don't matter [I]at all [/I]and he'll gain significantly more improvement through range and wind call improvement on any given shot than changing up a load that prints decently. Muzzle velocity statistics and BC % variation are long-range (1200+ yard) topics, inside that range I agree that pretty much all that matters is the group size because that wraps up all the p[possible variables in a final result. I use ATC instead of max spread for group size because it's more useful in layering results of multiple short strings, especially for something like a 300 RUM where if you care about the barrel you don't want to send 30 in a row down it without letting it cool down. That said, here's some math that doesn't really matter: Yes I agree that a 30FPS ES would be great..... the issue is that for [I]all future shots[/I] that his ES isn't really 31FPS, just like how in the 3-shot single digit ES/SDs that get posted the ES isn't really 1-9FPS. The ES of his very few shots were 31fps, but the inference to be made from the small sample is that the ES of any future group of 5 shots will be ~75-100 FPS (5-6x SD around the mean velocity) - if he shoots enough of them he'll eventually get a huge ES. Cal Zandt documented an SD 5.5/ ES 2 over 36 shots on a Lab Radar in one of his articles. That is an exceptional load because the ES is ~5x of SD, so the sample has already started to show normalization at the extreme ends. If the population has SD bands that matched a normal curve then he'd found a load that shows the type of consistency that will shoot well at long-range. Considering I think that was the 300 Norma he won the NF Steel Challenge with, that rifle worked out very well for him. But that was also shot at a distance where muzzle velocity stats mattered, not at or under 1000 yards. [URL unfurl="true"]https://precisionrifleblog.com/2020/12/05/muzzle-velocity-statistics-for-shooters/[/URL] [/QUOTE]
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