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Rifles, Reloading, Optics, Equipment
Rifles, Bullets, Barrels & Ballistics
case weights vs volumes
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<blockquote data-quote="Pdvdh" data-source="post: 1295244" data-attributes="member: 4191"><p>I've weighed 3,700 .223 casings from approximately 15-20 different manufacturers. </p><p></p><p>I learned a lot by the end of that effort. I recorded the weight of each case. Calculated the ES, SD, and Avg weight for each brand of casing. </p><p></p><p>The lightest brand weighed around 89gr Avg. The heaviest brand weighed around 107gr Avg. </p><p></p><p>Weighing brass provides a lot of useful information about case capacity. Whether or not the information is useful for you and your uses, is up to you and you alone.</p><p></p><p>I have to reduce a charge of Varget by 0.4gr to get comparable MV from a case weighing ~105gr, compared to a case weighing ~92gr.</p><p></p><p>If I shoot the same powder charge in the heavier case as I load in the 92gr case, I'll get ~175fps additional MV, along with substantially higher chamber pressures.</p><p></p><p>I now keep an 11"x17" printout [Excel Spreadsheet] of all the .223 casing weights and statistics according to brand, from lowest Avg weight to highest Avg weight on the back of a reloading wall cabinet door above my reloading bench as a handy reference.</p><p></p><p>If I'm going after maximum uniformity, I'll select a brand with the better uniformity. </p><p></p><p>I've culled 10-15% of cases in order to reduce the variance in case capacity. So there's maybe 400 cases bagged separately as seconds, which would only be used for plinking. Or more likely, will never be used by me.</p></blockquote><p></p>
[QUOTE="Pdvdh, post: 1295244, member: 4191"] I've weighed 3,700 .223 casings from approximately 15-20 different manufacturers. I learned a lot by the end of that effort. I recorded the weight of each case. Calculated the ES, SD, and Avg weight for each brand of casing. The lightest brand weighed around 89gr Avg. The heaviest brand weighed around 107gr Avg. Weighing brass provides a lot of useful information about case capacity. Whether or not the information is useful for you and your uses, is up to you and you alone. I have to reduce a charge of Varget by 0.4gr to get comparable MV from a case weighing ~105gr, compared to a case weighing ~92gr. If I shoot the same powder charge in the heavier case as I load in the 92gr case, I'll get ~175fps additional MV, along with substantially higher chamber pressures. I now keep an 11"x17" printout [Excel Spreadsheet] of all the .223 casing weights and statistics according to brand, from lowest Avg weight to highest Avg weight on the back of a reloading wall cabinet door above my reloading bench as a handy reference. If I'm going after maximum uniformity, I'll select a brand with the better uniformity. I've culled 10-15% of cases in order to reduce the variance in case capacity. So there's maybe 400 cases bagged separately as seconds, which would only be used for plinking. Or more likely, will never be used by me. [/QUOTE]
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Rifles, Reloading, Optics, Equipment
Rifles, Bullets, Barrels & Ballistics
case weights vs volumes
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