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<blockquote data-quote="QuietTexan" data-source="post: 2814521" data-attributes="member: 116181"><p>You're making two assumptions there: that outside dimensions are actually consistent, and that wall and head thickness are the same. Both of those are very incorrect assumptions.</p><p></p><p>There's more mass in the casehead than anywhere else in the case. Any variation in the casehead, the extractor groove cut, or in wall thickness will drastically alter the case weight/ case volume relationship. If neck dimensions vary =/- .0015", so does wall thickness. It's not hard to section a case and measure this for yourself.</p><p></p><p></p><p>Who cares if you can't get it all out right away? All that matters is how much water was in it when you weighted it. Let it dry out the same way as after wet tumbling.</p><ol> <li data-xf-list-type="ol">Insert primer plug</li> <li data-xf-list-type="ol">Put on scale and zero</li> <li data-xf-list-type="ol">Fill with water (water, alcohol, whatever you use)</li> <li data-xf-list-type="ol">Record weight</li> <li data-xf-list-type="ol">Dump and move to next case.</li> </ol><p>I normally use 91% isopropanol mixed with distilled water, the only change is I use a different factor when converting weight to volume. Even then this is a relative comparison inside a batch, so there's really no concern over how accurate to a standard the math is. The only reason I bother to convert is to make QL more accurate.</p><p></p><p>Primer pocket plug:</p><p>[URL unfurl="true"]https://21stcenturyinnovation.com/buy-online/ols/products/primer-pocket-plugs[/URL]</p></blockquote><p></p>
[QUOTE="QuietTexan, post: 2814521, member: 116181"] You're making two assumptions there: that outside dimensions are actually consistent, and that wall and head thickness are the same. Both of those are very incorrect assumptions. There's more mass in the casehead than anywhere else in the case. Any variation in the casehead, the extractor groove cut, or in wall thickness will drastically alter the case weight/ case volume relationship. If neck dimensions vary =/- .0015", so does wall thickness. It's not hard to section a case and measure this for yourself. Who cares if you can't get it all out right away? All that matters is how much water was in it when you weighted it. Let it dry out the same way as after wet tumbling. [LIST=1] [*]Insert primer plug [*]Put on scale and zero [*]Fill with water (water, alcohol, whatever you use) [*]Record weight [*]Dump and move to next case. [/LIST] I normally use 91% isopropanol mixed with distilled water, the only change is I use a different factor when converting weight to volume. Even then this is a relative comparison inside a batch, so there's really no concern over how accurate to a standard the math is. The only reason I bother to convert is to make QL more accurate. Primer pocket plug: [URL unfurl="true"]https://21stcenturyinnovation.com/buy-online/ols/products/primer-pocket-plugs[/URL] [/QUOTE]
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