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Rifles, Reloading, Optics, Equipment
Reloading
To turn or not (necks)
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<blockquote data-quote="woods" data-source="post: 278256" data-attributes="member: 6042"><p>I think we are well past the simple basics of internal ballistics and reloading here and are operating on theory, sorta like how they discovered black holes with lack of direct evidence but with the combination of theories and implied influences. Almost all this is not verifiable with direct measurement and at best is an educated theory. </p><p></p><p>Also we are down to minutiae (sp?) when it comes to what the sequence of events is in the milliseconds of the firing sequence. The variance in neck thickness is one of the larger and more verifiable things that we are talking about here and thus may be one of the last controllable things that you can do that will have any significant and identifiable effects on consistancy of the bullet release and firing sequence.</p><p></p><p>"Woods, I still would like to know how the relation of case neck thickness to neck tension is derived. Is there research or numbers somewhere?"</p><p></p><p>I'm not sure where I have said that the brass thickness at the neck has a direct correlation to neck tension. What I'm sure I have said somewhere is that you can vary the neck tension (inside diameter) by sizing the entire neck to a smaller dimension. Also I do believe that if you have thicker brass on one side of the neck then that brass will resist stetching from the bullet seating more than the thin side and cant the bullet (runout) and that the thicker brass will expand to the chamber walls slower than the thinner side during the firing sequence. But I do not believe that these effects (other than the runout) will have a large enough significance to make an identifiable significance on paper.</p><p></p><p>Like nheninge said the cases with identifiable neck thickness variations have those same thickness variations carried down through the case body (also something taken on faith since I have not seen proof of this). It may be possible if this is true that in severe cases you will have a dissimilar expansion and a sort of bannana effect upon firing.</p><p></p><p>If anyone has a link it would be interesting and informative to this discussion to see the actual formation process of the brass by the manufacturer.</p></blockquote><p></p>
[QUOTE="woods, post: 278256, member: 6042"] I think we are well past the simple basics of internal ballistics and reloading here and are operating on theory, sorta like how they discovered black holes with lack of direct evidence but with the combination of theories and implied influences. Almost all this is not verifiable with direct measurement and at best is an educated theory. Also we are down to minutiae (sp?) when it comes to what the sequence of events is in the milliseconds of the firing sequence. The variance in neck thickness is one of the larger and more verifiable things that we are talking about here and thus may be one of the last controllable things that you can do that will have any significant and identifiable effects on consistancy of the bullet release and firing sequence. "Woods, I still would like to know how the relation of case neck thickness to neck tension is derived. Is there research or numbers somewhere?" I'm not sure where I have said that the brass thickness at the neck has a direct correlation to neck tension. What I'm sure I have said somewhere is that you can vary the neck tension (inside diameter) by sizing the entire neck to a smaller dimension. Also I do believe that if you have thicker brass on one side of the neck then that brass will resist stetching from the bullet seating more than the thin side and cant the bullet (runout) and that the thicker brass will expand to the chamber walls slower than the thinner side during the firing sequence. But I do not believe that these effects (other than the runout) will have a large enough significance to make an identifiable significance on paper. Like nheninge said the cases with identifiable neck thickness variations have those same thickness variations carried down through the case body (also something taken on faith since I have not seen proof of this). It may be possible if this is true that in severe cases you will have a dissimilar expansion and a sort of bannana effect upon firing. If anyone has a link it would be interesting and informative to this discussion to see the actual formation process of the brass by the manufacturer. [/QUOTE]
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Reloading
To turn or not (necks)
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