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Weighing new brass
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<blockquote data-quote="Steve Sheasly" data-source="post: 1507379" data-attributes="member: 103826"><p>exactly right. I did after many hours find a procedure that produces consistent and repeatable results. I took one case and prepped it as you suggested above including neck turning, flash hole cleaning, deburring, chamfering, once fired cleaned and polished. </p><p>Then I put a new primer in this one case. I filled the case with various powders, including salt and not one time did any of these materials repeat measurement. I took a flat used planer blade to pack and scrape the excess off. I also used a calibration weight and set it on the over filled case. None of these created the same measurement. I was off .1 to 1 grain.</p><p>So i took the case used a compressor to clean the case out and filled it with alcohol. Hard to find 200 proof/100% alcohol but it is out there. </p><p>Here is what I did to get the measurement to repeat -- exactly over 10 times. It works on other cases as well. </p><p>I filled with an eye dropper to the rim then I kept filling as the meniscus rose out of the case (concave with water as water likes itself more than teh case walls. Alcohol is exact opposite so a convex meniscus is the resultant) I kept adding one drop until it just spilled over the lip. A tissue soaked up the very small amount and my loading room is kept at a constant temperature as well so the alcohol evaporates quickly. So I have the procedure by empirical testing and data that is consistent and repeatable forrgot to mention. I would tare my scale with each case. Then put the case back on the scale an most of the time i was .5 grain high so I would blow the case out and it would tare. Then I built a spread sheet to log the results. An average deviation or standard deviation was not applicable although these results are on my spread sheet. I wrote my own formula using Max -Min function to get spread and set the alarm at .5 grain volume difference. Then I group the brass and use the one with the most cartridges and wait to populate the other groups. </p><p>I do have 100 cases of Lapua .338LM coming tomorrow. I will do the same on this brass with out firing just to see how close they are. </p><p></p><p>I know this is a lot of work. But i only load 100 rounds or so for hunting and use the rest on my own range. I can go out thousands of yards in my back yard. We live on a wheat ranch. </p><p></p><p>I hate using alcohol on a primer then loading the case to fire. I have an email into CCI to see if alcohol will ruin or negatively affect the ignition of the primer.</p></blockquote><p></p>
[QUOTE="Steve Sheasly, post: 1507379, member: 103826"] exactly right. I did after many hours find a procedure that produces consistent and repeatable results. I took one case and prepped it as you suggested above including neck turning, flash hole cleaning, deburring, chamfering, once fired cleaned and polished. Then I put a new primer in this one case. I filled the case with various powders, including salt and not one time did any of these materials repeat measurement. I took a flat used planer blade to pack and scrape the excess off. I also used a calibration weight and set it on the over filled case. None of these created the same measurement. I was off .1 to 1 grain. So i took the case used a compressor to clean the case out and filled it with alcohol. Hard to find 200 proof/100% alcohol but it is out there. Here is what I did to get the measurement to repeat -- exactly over 10 times. It works on other cases as well. I filled with an eye dropper to the rim then I kept filling as the meniscus rose out of the case (concave with water as water likes itself more than teh case walls. Alcohol is exact opposite so a convex meniscus is the resultant) I kept adding one drop until it just spilled over the lip. A tissue soaked up the very small amount and my loading room is kept at a constant temperature as well so the alcohol evaporates quickly. So I have the procedure by empirical testing and data that is consistent and repeatable forrgot to mention. I would tare my scale with each case. Then put the case back on the scale an most of the time i was .5 grain high so I would blow the case out and it would tare. Then I built a spread sheet to log the results. An average deviation or standard deviation was not applicable although these results are on my spread sheet. I wrote my own formula using Max -Min function to get spread and set the alarm at .5 grain volume difference. Then I group the brass and use the one with the most cartridges and wait to populate the other groups. I do have 100 cases of Lapua .338LM coming tomorrow. I will do the same on this brass with out firing just to see how close they are. I know this is a lot of work. But i only load 100 rounds or so for hunting and use the rest on my own range. I can go out thousands of yards in my back yard. We live on a wheat ranch. I hate using alcohol on a primer then loading the case to fire. I have an email into CCI to see if alcohol will ruin or negatively affect the ignition of the primer. [/QUOTE]
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