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I'll throw a scenario out with that 1.25 MOA at 200. Your climbing a hill got some cross wind, breathing going on a good buck jumps up in front of you and now you got a little buck fever going on now whats your 1.25 MOA like you had at the range?
Or a buck or bull of a lifetime presents itself at 400 now is that 1.25 MOA with the above conditions now what do you do with your 1.25 MOA gun?
These minute of deer guns are never that in hunting conditions there not the same as at the range.
Thanks for taking the time to share real data. My “assumption” has been that weight variation could be attributed to differences in the case head or other areas that would not impact volume.I've measured case weights and volumes using plugs; no statistical difference. i.e. the spent primer weight-to-weight variation is statistically insignificant.
Here are my plots showing the trend line and the "R-Squared". The R-Squared is a statistical calculation that determines how good the data correlates. A value of 1.0 is a perfect correlation and 0.0 means there's absolutely no correlation. For reference, in soft sciences like social sciences, a value of 0.2 - 0.4 is considered good. In pure sciences, a value of 0.6 is considered good. The R-Squared results I got are too small to indicate any correlations between case + spent primer weight and case capacity.
I have a lot more data, including on Nosler cases, but it all led me down the same pathway...........there isn't a statistical correlation between weights and capacities.
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If you take the time to weigh the brass to at least assure there are no outliers, then you will know the degree of variability as well. Since you have then invested 95% of the time required, why would you not segregate them if there is >1gr variability. Especially if you are a .02gr powder charge accuracy type of guy.Thanks for taking the time to share real data. My “assumption” has been that weight variation could be attributed to differences in the case head or other areas that would not impact volume.
Your data actually shows a pretty good correlation between weight and internal volume. R-squared is interpreted as the amount of variation in the output that can be explained by variation n the input. Here (for 223 ) your data suggests that over 45% of the variation in volume can be attributed to case weight variation… statistically, that is pretty solid. However, the real question is, “is the observed variation in case capacity practically significant?”
Is the observed variation practically significant? Good question @cdgaydosThanks for taking the time to share real data. My “assumption” has been that weight variation could be attributed to differences in the case head or other areas that would not impact volume.
Your data actually shows a pretty good correlation between weight and internal volume. R-squared is interpreted as the amount of variation in the output that can be explained by variation n the input. Here (for 223 ) your data suggests that over 45% of the variation in volume can be attributed to case weight variation… statistically, that is pretty solid. However, the real question is, “is the observed variation in case capacity practically significant?”
"Don't practice missing"I appreciate all your suggestions about "practical" precision, all very true and practiced in my non-competitive experience too.
And to qualify my latent obsession with precision in my reloading practices, it comes from my also-latent practical shooting practice of; "aim small = miss small" , and "DON'T practice missing" .
These on-line discussions help me focus, slow my heart rate and breathing, and give me time to reconsider my target, before I pull the trigger,
I only weigh cases as part of the process of calculating their capacity, and that's best done once they have been fired and have grown to fit your rifle's chamber.When do you weigh cases? Should it be done on new brass or can it be done on fired brass?
Nice! Results look good and it's got to be faster than the standard "weigh, add water, weigh again" that most of us use.I’ve been sorting by weight, H2O volume and now I’m using the Bison Armory Volume Gauge to periodically check my case capacity looking for an occasional outlier
There’s a slight learning curve to get consistent results with this tool but once you figure it out it’s the quickest and most reliable method I’ve tried so far
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Mark , you have the best toys by far …I’ve been sorting by weight, H2O volume and now I’m using the Bison Armory Volume Gauge to periodically check my case capacity looking for an occasional outlier
There’s a slight learning curve to get consistent results with this tool but once you figure it out it’s the quickest and most reliable method I’ve tried so far
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From my use with this, so far 2 things effect the volumizer.I’ve been sorting by weight, H2O volume and now I’m using the Bison Armory Volume Gauge to periodically check my case capacity looking for an occasional outlier
There’s a slight learning curve to get consistent results with this tool but once you figure it out it’s the quickest and most reliable method I’ve tried so far
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