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Rifles, Reloading, Optics, Equipment
Reloading
Weight Sorting Brass
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<blockquote data-quote="918v" data-source="post: 1004879" data-attributes="member: 84964"><p>If you end up with different internal volumes with same weight brass from the same make and lot then you erred in your volume test.</p><p></p><p>I just did two Winchester 308 cases that are 1.5grs apart in weight and they are .7grs apart in water volume. </p><p></p><p>In the past I have tested numerous FC, LC, and Lapua cases and found if I sorted to .5gr the case volume variance was insignificant. I currently sort my brass into 1gr lots for expediency. </p><p></p><p>When establishing volume you have to make sure the cases are from the same lot and have the same length. I collect brass and noted noticeable dimensional differences within brass of the same make over the years. Casehead diameters vary, extractor groove diameters vary, neck thickness, etc. A Winchester case from the 80's is not the same as one made today. Neither is FC. Second, you have to make sure you don't have air bubbles in the case. Third, you have to let the water migrate inside the primer pocket. Finally, you have to make sure the shape of the meniscus is identical between cases. That meniscus is worth half a grain of water on a 30 cal neck. </p><p></p><p>For me, sorting Lapua by weight into 1gr lots cut the ES by 20 FPS. From 40 to 20 is pretty significant.</p></blockquote><p></p>
[QUOTE="918v, post: 1004879, member: 84964"] If you end up with different internal volumes with same weight brass from the same make and lot then you erred in your volume test. I just did two Winchester 308 cases that are 1.5grs apart in weight and they are .7grs apart in water volume. In the past I have tested numerous FC, LC, and Lapua cases and found if I sorted to .5gr the case volume variance was insignificant. I currently sort my brass into 1gr lots for expediency. When establishing volume you have to make sure the cases are from the same lot and have the same length. I collect brass and noted noticeable dimensional differences within brass of the same make over the years. Casehead diameters vary, extractor groove diameters vary, neck thickness, etc. A Winchester case from the 80's is not the same as one made today. Neither is FC. Second, you have to make sure you don't have air bubbles in the case. Third, you have to let the water migrate inside the primer pocket. Finally, you have to make sure the shape of the meniscus is identical between cases. That meniscus is worth half a grain of water on a 30 cal neck. For me, sorting Lapua by weight into 1gr lots cut the ES by 20 FPS. From 40 to 20 is pretty significant. [/QUOTE]
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Weight Sorting Brass
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