reconsidering measuring case weight

[tunered]

This thread reminds me of Climate change, or, Global Warming. LOL

 

[savagedasher]

This thread reminds me of Climate change, or, Global Warming. LOL

Jim spent may of hours weighing . Then posted the facts .
I started doing it year ago. With out doing it you mite as well not have a scale. Larry

 

[dmoran]

With interest in Jim Casey's case weight to capacity qualification of his 223 Lapua brass, and seeing that the "correlation" was very poor, I couldn't help but wonder how poor by percentage. So I took the time to data enter his data into my own spreadsheet and chart out the data to include the % of Correlation Coefficient as well as the R-squared value of the coefficient. Attaching the charted screenshot and the Excel workbook used:
Thanks Jim for sharing your time spent finding the truth of your cases.
Donovan

 

[Ghansen]

Is there a specific correlation between dry case weight of identically prepped cases and measured wet case volume ?

 

[savagedasher]

Is there a specific correlation between dry case weight of identically prepped cases and measured wet case volume ?

Just from a quick check I found from the chart found cases with over a grain difference in dry weight that had the same capacity of H20. Larry

 

[Ghansen]

Thanks Larry, I'll prepare some sample lots.

 

[jimcasey01]

With interest in Jim Casey's case weight to capacity qualification of his 223 Lapua brass, and seeing that the "correlation" was very poor, I couldn't help but wonder how poor by percentage. So I took the time to data enter his data into my own spreadsheet and chart out the data to include the % of Correlation Coefficient as well as the R-squared value of the coefficient. Attaching the charted screenshot and the Excel workbook used:
Thanks Jim for sharing your time spent finding the truth of your cases.
Donovan

Donovan, as you are aware this is for a small sample of the cases I have. Others' results may be completely different. I would hope that someone would do a similar study to see if they also have the same or similar results. I can say with certainty that I am not an analyst with the attendant proficiency that they would have. I just hope that I did not screw it up too bad, as a lot of time was involved. I would like to think that my data is accurate.

 

[dmoran]

Jim -
I'm sure your data is accurate, or at least accurate to you, which is the main thing...
Your dry weights to wet weights correlate 92%, which to me shows good accuracy in your procedure.
Same as I stated to Tony above, poor correlation is very typical of what I see more times then not as well.
But am a little surprised at how large of variation from such a small case you ended up with.
Donovan