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Rifles, Reloading, Optics, Equipment
Reloading
I need some help from the reloading gurus.
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<blockquote data-quote="cdherman" data-source="post: 2787784" data-attributes="member: 12282"><p>Best response of entire thread. Guess I must have flunked physics in terms of my gross misunderstanding of solid matter properties. IIRC I got an A. In college. In case you disagree this is a physics question. I got an A in chemistry and calculus too.</p><p></p><p>Listen: I think it is correct that between different brands of brass (and for that matter different lots from the same manufacturer) the weight of the brass may not correlate completely with capacity. The thin walls of a case expand totally to the confines of the chamber upon firing (assuming a full power charge of powder). If the base/web area is reasonably consistent, then the space within the case during firing will vary based on the amount of brass in the walls. This statement is a law of physics, not opinion.</p><p></p><p>I would hope and also believe that a given lot of brass from a given manufacturer will have some degree of consistency in the base region. At least they will be using the same equipment and setting the equipment to the same tolerances. I will note: I've have even Lapua brass show bimodal or trimodal weight curves, making me think that they had more than one machine producing brass and the 2 or three lines were not perfectly in tune.</p><p></p><p>I would guess that there is a lot of brass in the base. But there is a lot of brass in the walls too, since the case is a lot longer than just the base. I don't really know just how much the ratio of un-expandable brass in the base is to the rest of the case. (what I do know, is that once you start expanding the base, you are into deep dodo...)</p><p></p><p>If the variation in brass weight is in the base, then I will concede that weighing brass is less useful. I don't know the answer to that question. </p><p></p><p>Anyone?</p></blockquote><p></p>
[QUOTE="cdherman, post: 2787784, member: 12282"] Best response of entire thread. Guess I must have flunked physics in terms of my gross misunderstanding of solid matter properties. IIRC I got an A. In college. In case you disagree this is a physics question. I got an A in chemistry and calculus too. Listen: I think it is correct that between different brands of brass (and for that matter different lots from the same manufacturer) the weight of the brass may not correlate completely with capacity. The thin walls of a case expand totally to the confines of the chamber upon firing (assuming a full power charge of powder). If the base/web area is reasonably consistent, then the space within the case during firing will vary based on the amount of brass in the walls. This statement is a law of physics, not opinion. I would hope and also believe that a given lot of brass from a given manufacturer will have some degree of consistency in the base region. At least they will be using the same equipment and setting the equipment to the same tolerances. I will note: I've have even Lapua brass show bimodal or trimodal weight curves, making me think that they had more than one machine producing brass and the 2 or three lines were not perfectly in tune. I would guess that there is a lot of brass in the base. But there is a lot of brass in the walls too, since the case is a lot longer than just the base. I don't really know just how much the ratio of un-expandable brass in the base is to the rest of the case. (what I do know, is that once you start expanding the base, you are into deep dodo...) If the variation in brass weight is in the base, then I will concede that weighing brass is less useful. I don't know the answer to that question. Anyone? [/QUOTE]
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Rifles, Reloading, Optics, Equipment
Reloading
I need some help from the reloading gurus.
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