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Rifles, Reloading, Optics, Equipment
Reloading
REAL differences in sizing methods?
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<blockquote data-quote="tlk" data-source="post: 369594" data-attributes="member: 11397"><p>OK, after almost year later, this thread makes a lot more sense than it did before.</p><p> </p><p>Woods, I got a long question now: What I think I am seeing is that if I bump the shoulder .001 to .002 off the chamber datum and I leave part of the neck unsized, then the amount of "wallow" in the bottom of the chamber that the shoulder setback alone would cause will be potentially minimized, leaving only the diffefence between the chamber ID and the unsized case neck OD as the amount of "off-center" alignment that the bullet starts out with (assuming necks have been turned to a consistent thickness).</p><p> </p><p>Question is, how much of the neck do should I leave unsized? IOW, how thick does that washer need to be? Do I size only enough of the neck to grip all of the bullet and no more? IOW, would the answer be (warning, math involved!<img src="data:image/gif;base64,R0lGODlhAQABAIAAAAAAAP///yH5BAEAAAAALAAAAAABAAEAAAIBRAA7" class="smilie smilie--sprite smilie--sprite8" alt=":D" title="Big Grin :D" loading="lazy" data-shortname=":D" />): </p><p> </p><p>Knowns:</p><p>a. (COAL, ogive)</p><p>b. (bullet length from the ogive to the base). </p><p>c. Trimmed case length</p><p> </p><p>Derived:</p><p>d. (a-c) = exposed bullet (from ogive) </p><p> </p><p>e. (b-d) = bullet in case neck</p><p> </p><p>(e) would be the amount of neck that you would size since that would correlate to the amount of bullet in the brass.</p><p> </p><p>Essentially this takes all the knowns/established characteristics and determines the MINIMAL adjustments to be made to the brass.</p><p> </p><p>You could work from the case head to be safe from case length variations, but the idea would be the same. Also, this would have to be a bullet specifc calculation and the bullet would have to be set at the same depth each time.</p><p> </p><p>I know this is a little egg-heady and probably over engineered since it doesn't need to be THAT exact, but let me know if this is the right idea. At any rate, you want to leave as much of the case neck unsized as possible, correct?</p><p> </p><p>This should be fairly easy to accomplish with washers, with the equation giving you a fairly specific neck area that you MUST size at a minimum.</p><p> </p><p>Specs for my chamber: 2.0375", bolt face to datum. I will be bumping shoulders from 2.0365" to 2.035". Dont know how .0015 exact I can really get with the bump die.</p><p> </p><p>Thanks for the help with this one.</p></blockquote><p></p>
[QUOTE="tlk, post: 369594, member: 11397"] OK, after almost year later, this thread makes a lot more sense than it did before. Woods, I got a long question now: What I think I am seeing is that if I bump the shoulder .001 to .002 off the chamber datum and I leave part of the neck unsized, then the amount of "wallow" in the bottom of the chamber that the shoulder setback alone would cause will be potentially minimized, leaving only the diffefence between the chamber ID and the unsized case neck OD as the amount of "off-center" alignment that the bullet starts out with (assuming necks have been turned to a consistent thickness). Question is, how much of the neck do should I leave unsized? IOW, how thick does that washer need to be? Do I size only enough of the neck to grip all of the bullet and no more? IOW, would the answer be (warning, math involved!:D): Knowns: a. (COAL, ogive) b. (bullet length from the ogive to the base). c. Trimmed case length Derived: d. (a-c) = exposed bullet (from ogive) e. (b-d) = bullet in case neck (e) would be the amount of neck that you would size since that would correlate to the amount of bullet in the brass. Essentially this takes all the knowns/established characteristics and determines the MINIMAL adjustments to be made to the brass. You could work from the case head to be safe from case length variations, but the idea would be the same. Also, this would have to be a bullet specifc calculation and the bullet would have to be set at the same depth each time. I know this is a little egg-heady and probably over engineered since it doesn't need to be THAT exact, but let me know if this is the right idea. At any rate, you want to leave as much of the case neck unsized as possible, correct? This should be fairly easy to accomplish with washers, with the equation giving you a fairly specific neck area that you MUST size at a minimum. Specs for my chamber: 2.0375", bolt face to datum. I will be bumping shoulders from 2.0365" to 2.035". Dont know how .0015 exact I can really get with the bump die. Thanks for the help with this one. [/QUOTE]
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REAL differences in sizing methods?
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