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Rifles, Reloading, Optics, Equipment
Reloading
brass weight sorting
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<blockquote data-quote="Mikecr" data-source="post: 561553" data-attributes="member: 1521"><p>Edd, I don't know as I haven't done this as a weight-vs-capacity experiment using any scientific method. That would be a bigger endeavor than it seems I'm sure.</p><p></p><p>I have observed weight of cases followed by capacity measure and found that it's often an abstract correlation.</p><p>3 things I find:</p><p>Cases weighing the same having different capacity</p><p>Cases weighing differently but having the same capacity</p><p>Cases in some brass lots showing a direct and predictable relationship, while other brass lots for the same cartridge were not so kind.</p><p></p><p>With this, I don't recognize weight measure as an 'alternative' to capacity measure(any more than I would recognize culver clicks as an alternative to powder measure).. It would be sweet if I could, but it's too late. I already know this assumption is wrong, and any bad shots downstream of it would just bring it back to suspicion. </p><p>I've heard of BR shooters tossing brass on flyers, and I suspect this and other common shortcuts combine to lead them to it. </p><p>You could do that. </p><p></p><p>I take each fired-unsized case, deprime it(with a hand decapper) and stand it on a plastic golf tee on a scale(the tee is inserted consistently into the flash hole). Then I zero the scale, and eyedrop water into the case until full to case mouth. Then I touch the meniscus with a tissue corner to flatten it flush with the case mouth and record the H20 capacity. I usually have a cup of water on the side with a few drops of alcohol in it to reduce water tension.</p><p></p><p>I typically lose ~10-15% of my cases(Lapua, Norma, Win) to measured capacity variance. I lost over half to thickness & thickness variance well before this..</p><p>That's not bad for me though because brass is cheaper than my efforts, and my remaining cases will outlast many barrels.</p><p>They are truly matched, and straight, and I can scratch these factors off the list.</p><p></p><p>I don't full length size cases –ever. </p><p>If you do then there is likely less gain in this as your capacities could change with every cycle. This would of course be a detriment to capacity specific testing. And then you could only match capacities before any FL sizing, for a baseline.</p><p>If that sucks, well then you could just match cases by weight, and no matter how you size them or how they perform, they will always weigh the same(if that makes ya feel better)..</p><p></p><p>I've also heard it said that cases continue to grow(beyond fireformed baseline) –if you don't FL size. Well I'm telling you that is only true when you cause it to be so.</p><p>I don't have this issue, and will never run into it.</p><p>I could check my cases with 30+ reloads on them today, and they would measure EXACTLY the same as I set way back.</p><p>This is because I matched them to begin with, and I avoid poor cartridge designs, extreme pressures, and over-sizing. </p><p>I do have to bump 30-35deg shoulders, but that's as sad as I accept right there. </p><p>I limit my pressures to 57Kpsi per QuickLoad (regardless of SAAMI max) because so far I measure brass yield beyond that.</p><p></p><p>I choose a capacity that gives me what I need from my bullets without destroying matched brass.</p><p></p><p>As far as competition and competitive performance, you better do what you have to do is my guess. I don't compete.</p><p>I know extreme pressures can be used to work around deficiencies in ammo, as proven over & over with 6PPCs/30brs at short range. But it appears to me that 'consistent' 1/2moa of accuracy is beyond even winning 1kyd shooters. And I don't see a need to work around anything for 1/2moa, or even 1/4moa of accuracy.</p><p>From any angle, I don't see where matching capacity would hurt competitive performance.</p></blockquote><p></p>
[QUOTE="Mikecr, post: 561553, member: 1521"] Edd, I don’t know as I haven’t done this as a weight-vs-capacity experiment using any scientific method. That would be a bigger endeavor than it seems I’m sure. I have observed weight of cases followed by capacity measure and found that it’s often an abstract correlation. 3 things I find: Cases weighing the same having different capacity Cases weighing differently but having the same capacity Cases in some brass lots showing a direct and predictable relationship, while other brass lots for the same cartridge were not so kind. With this, I don’t recognize weight measure as an ‘alternative’ to capacity measure(any more than I would recognize culver clicks as an alternative to powder measure).. It would be sweet if I could, but it’s too late. I already know this assumption is wrong, and any bad shots downstream of it would just bring it back to suspicion. I’ve heard of BR shooters tossing brass on flyers, and I suspect this and other common shortcuts combine to lead them to it. You could do that. I take each fired-unsized case, deprime it(with a hand decapper) and stand it on a plastic golf tee on a scale(the tee is inserted consistently into the flash hole). Then I zero the scale, and eyedrop water into the case until full to case mouth. Then I touch the meniscus with a tissue corner to flatten it flush with the case mouth and record the H20 capacity. I usually have a cup of water on the side with a few drops of alcohol in it to reduce water tension. I typically lose ~10-15% of my cases(Lapua, Norma, Win) to measured capacity variance. I lost over half to thickness & thickness variance well before this.. That’s not bad for me though because brass is cheaper than my efforts, and my remaining cases will outlast many barrels. They are truly matched, and straight, and I can scratch these factors off the list. I don’t full length size cases –ever. If you do then there is likely less gain in this as your capacities could change with every cycle. This would of course be a detriment to capacity specific testing. And then you could only match capacities before any FL sizing, for a baseline. If that sucks, well then you could just match cases by weight, and no matter how you size them or how they perform, they will always weigh the same(if that makes ya feel better).. I’ve also heard it said that cases continue to grow(beyond fireformed baseline) –if you don’t FL size. Well I’m telling you that is only true when you cause it to be so. I don’t have this issue, and will never run into it. I could check my cases with 30+ reloads on them today, and they would measure EXACTLY the same as I set way back. This is because I matched them to begin with, and I avoid poor cartridge designs, extreme pressures, and over-sizing. I do have to bump 30-35deg shoulders, but that’s as sad as I accept right there. I limit my pressures to 57Kpsi per QuickLoad (regardless of SAAMI max) because so far I measure brass yield beyond that. I choose a capacity that gives me what I need from my bullets without destroying matched brass. As far as competition and competitive performance, you better do what you have to do is my guess. I don’t compete. I know extreme pressures can be used to work around deficiencies in ammo, as proven over & over with 6PPCs/30brs at short range. But it appears to me that ‘consistent’ 1/2moa of accuracy is beyond even winning 1kyd shooters. And I don’t see a need to work around anything for 1/2moa, or even 1/4moa of accuracy. From any angle, I don’t see where matching capacity would hurt competitive performance. [/QUOTE]
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