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Rifles, Reloading, Optics, Equipment
Reloading
procedure for measuring case volume
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<blockquote data-quote="rscott5028" data-source="post: 639566" data-attributes="member: 24624"><p>I don't want to be too quick to draw conclusions from one small sample set. But, here are some thoughts...</p><p> </p><p>From the data, I do not see a direct correlation between case weight and case capacity with this lot of brass. </p><p> </p><p>I think it shows that Lapua brass is pretty consistent to begin with. ..only 1gr spread although 6br is a small cartridge to begin with. Perhaps testing with a WSM or RUM would yeild different results? Or, possibly I'm at or near my "node" where small variance in the load isn't going to have as much influence on performance? </p><p> </p><p>With the brass all sorted in ascending order by water weight capacity, it appears that velocity goes up as case capacity increases while holding powder charge constant. </p><p> </p><p>However, that's reverse from my prior understanding. (Perhaps someone might explain?) ...although the shots were fired throughout the morning as the temperature warmed. So, it's likeley that ambient case temperature has more bearing on MV than minor containment variation. </p><p> </p><p>I think the ES/SD for the samples was pretty good. And while I might attribute that laregly to good brass and careful case prep, I think I'll continue along this path for at least another batch or two before I deviate from something that appears to be working. ...even if I don't know for sure exactly why it's working. </p><p> </p><p>-- richard</p></blockquote><p></p>
[QUOTE="rscott5028, post: 639566, member: 24624"] I don't want to be too quick to draw conclusions from one small sample set. But, here are some thoughts... From the data, I do not see a direct correlation between case weight and case capacity with this lot of brass. I think it shows that Lapua brass is pretty consistent to begin with. ..only 1gr spread although 6br is a small cartridge to begin with. Perhaps testing with a WSM or RUM would yeild different results? Or, possibly I'm at or near my "node" where small variance in the load isn't going to have as much influence on performance? With the brass all sorted in ascending order by water weight capacity, it appears that velocity goes up as case capacity increases while holding powder charge constant. However, that's reverse from my prior understanding. (Perhaps someone might explain?) ...although the shots were fired throughout the morning as the temperature warmed. So, it's likeley that ambient case temperature has more bearing on MV than minor containment variation. I think the ES/SD for the samples was pretty good. And while I might attribute that laregly to good brass and careful case prep, I think I'll continue along this path for at least another batch or two before I deviate from something that appears to be working. ...even if I don't know for sure exactly why it's working. -- richard [/QUOTE]
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Rifles, Reloading, Optics, Equipment
Reloading
procedure for measuring case volume
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