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Rifles, Reloading, Optics, Equipment
Rifles, Bullets, Barrels & Ballistics
case weights vs volumes
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<blockquote data-quote="Tesoro" data-source="post: 1295212" data-attributes="member: 44340"><p><strong>Mass = Volume?</strong></p><p></p><p>I spoke to one of the guys at Redding yesterday ref a die issue. We got into a case discussion briefly and neck turning. He said he gauges the quality of an individual new case by measuring the neck wall as any large variation will carry on into the case body wall. Any variation of 1.5 tho and over gets tossed. And he dosent bother turning the necks if within spec.</p><p></p><p>I laid out 50 new LC 223 trimmed brass yesterday for a test to this. Neck thickness was .0115 to .0125 consistently - none were tossed.</p><p></p><p>Of the 50 about 70% weighed in the same grain range of ie 93.0-93.9...the rest were either one grain heavier or lighter...ie 94.0-94.9 and 92.0 to 92.9 grains. I took 4 of each 1 grain over and 1 grain under the 93 range that weighed the same or within a grain. I then did a vol test with ball powder. The results showed that the volumes were pretty much the same with a 2 grain spread in weights.</p><p></p><p>And then I realized this exercise was pretty much a waste of time when I thought about how casings are made! The brass is drawn over mandrels in stages to stretch it and form it punch it etc and somehow any excess brass must form/expand on the outside of the case and not the inside. This is backed up by neck turning the outside of the neck to even the thickness vs reaming the inside which dosent do it.</p><p></p><p>So is the moral of the story to sort NEW brass by checking neck consistency like the Redding guy said!? Ha.. And only check volumes for certain case batches for comparison of power charges and published load data with case vol notations. </p><p></p><p>Its raining windy and cant shoot so I am obviously in the overthinking mode.</p></blockquote><p></p>
[QUOTE="Tesoro, post: 1295212, member: 44340"] [b]Mass = Volume?[/b] I spoke to one of the guys at Redding yesterday ref a die issue. We got into a case discussion briefly and neck turning. He said he gauges the quality of an individual new case by measuring the neck wall as any large variation will carry on into the case body wall. Any variation of 1.5 tho and over gets tossed. And he dosent bother turning the necks if within spec. I laid out 50 new LC 223 trimmed brass yesterday for a test to this. Neck thickness was .0115 to .0125 consistently - none were tossed. Of the 50 about 70% weighed in the same grain range of ie 93.0-93.9...the rest were either one grain heavier or lighter...ie 94.0-94.9 and 92.0 to 92.9 grains. I took 4 of each 1 grain over and 1 grain under the 93 range that weighed the same or within a grain. I then did a vol test with ball powder. The results showed that the volumes were pretty much the same with a 2 grain spread in weights. And then I realized this exercise was pretty much a waste of time when I thought about how casings are made! The brass is drawn over mandrels in stages to stretch it and form it punch it etc and somehow any excess brass must form/expand on the outside of the case and not the inside. This is backed up by neck turning the outside of the neck to even the thickness vs reaming the inside which dosent do it. So is the moral of the story to sort NEW brass by checking neck consistency like the Redding guy said!? Ha.. And only check volumes for certain case batches for comparison of power charges and published load data with case vol notations. Its raining windy and cant shoot so I am obviously in the overthinking mode. [/QUOTE]
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