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Rifles, Reloading, Optics, Equipment
Reloading
"Jamming" bullet into the lands?
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<blockquote data-quote="boomtube" data-source="post: 448157" data-attributes="member: 9215"><p><em>"In the 1960's there was the NRA and US ARMY article "Gauging Bullet Tilt" By A. A. ABBATIELLO, that has a mathematical derivation connecting concentricity with accuracy."</em></p><p> </p><p>A very interesting American Rifleman article it was (and remains). I still have it around somewhere, lost in my nearly three foot high stack of old un-classified photocopy files. Few of us had any means of checking run-out at that time but the article encouraged the development of practical and affordable gages. Today they are readily available and easily within the reach of most reloaders; that makes me happy! <img src="data:image/gif;base64,R0lGODlhAQABAIAAAAAAAP///yH5BAEAAAAALAAAAAABAAEAAAIBRAA7" class="smilie smilie--sprite smilie--sprite1" alt=":)" title="Smile :)" loading="lazy" data-shortname=":)" /></p><p> </p><p> </p><p><em>"There is one advantage to jamming the lands, accuracy."</em></p><p> </p><p>Surely no one has said or even implied that run-out doesn't matter; it obviously does. The issue is, how effective is seating jammed for reducing run-out. Demonstrable fact is, it MIGHT help but, again, it might not, it's certainly not a given fact. Not only I but LOTS of others, including some very serious BR guys, can say that it really isn't consistant (especially in factory chambers) while there are ways to reduce run-out that ALWAYS work! <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></blockquote><p></p>
[QUOTE="boomtube, post: 448157, member: 9215"] [I]"In the 1960's there was the NRA and US ARMY article "Gauging Bullet Tilt" By A. A. ABBATIELLO, that has a mathematical derivation connecting concentricity with accuracy."[/I] A very interesting American Rifleman article it was (and remains). I still have it around somewhere, lost in my nearly three foot high stack of old un-classified photocopy files. Few of us had any means of checking run-out at that time but the article encouraged the development of practical and affordable gages. Today they are readily available and easily within the reach of most reloaders; that makes me happy! :) [I]"There is one advantage to jamming the lands, accuracy."[/I] Surely no one has said or even implied that run-out doesn't matter; it obviously does. The issue is, how effective is seating jammed for reducing run-out. Demonstrable fact is, it MIGHT help but, again, it might not, it's certainly not a given fact. Not only I but LOTS of others, including some very serious BR guys, can say that it really isn't consistant (especially in factory chambers) while there are ways to reduce run-out that ALWAYS work! :D [/QUOTE]
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Rifles, Reloading, Optics, Equipment
Reloading
"Jamming" bullet into the lands?
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