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Rifles, Reloading, Optics, Equipment
Reloading
Concentricity .. how important?
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<blockquote data-quote="bigedp51" data-source="post: 1441142" data-attributes="member: 28965"><p>The last time you said you were going to put me on your ignore list and you didn't.</p><p>And you do not have to explain anything to me because you are a condescending know it all.</p><p>Do you actually think you are the only one in the world who knows how to reload.</p><p>Stick to making muzzle breaks and stop trying to dominate this forum.</p><p></p><p>P.S. Whidden custom dies doesn't make neck sizing dies, because competitive shooters no longer neck size.</p><p></p><p>And your vast knowledge is truly amazing.......................</p><p></p><p></p><p></p><p></p><p><strong>NECO CONCENTRICITY, WALL THICKNESS AND RUNOUT GAUGE</strong></p><p><strong><a href="http://www.neconos.com/details.htm" target="_blank">http://www.neconos.com/details.htm</a></strong></p><p></p><p>Also referred to as "The Case Gauge," this item is designed to measure:</p><p></p><p><span style="color: #ff0000"><strong>1) The curved "banana" shape of the cartridge case;</strong></span></p><p>2) The relative wall thickness variation of a cartridge case;</p><p>3) The cartridge case head out-of-squareness;</p><p>4) Individual Bullets - out-of-round "egg shape" and/or</p><p>curved "banana" shape (excepting very small bullets);</p><p>5) The seated bullet and cartridge runout of loaded rounds. The accuracy of any firearm is determined -- and limited -- by the quality of the ammunition shot in it. The effect of imperfections in ammunition is cumulative; each flaw adds to the influence of all others. Precision shooters spend much time and effort "uniforming" cartridge cases, using advanced techniques to eliminate variation. Yet until recently, one of the most important of these variations has not been susceptible to detection by any device readily available to marksmen.</p><p></p><p><strong>Normal manufacturing tolerances cause brass cartridge cases to vary in wall thickness around the circumference of their bodies. Under the stress of firing, a case with such variation stretches more readily along its thin side, transferring more pressure to the bolt face at that point and introducing an unbalanced force which contributes to bolt whip and vibration of the barreled action in its bedding.</strong> This whip and vibration varies from one shot to the next as cartridges are fired with their thin sides randomly oriented at different angles, causing reduced accuracy. The problem is made even worse if the brass is too hard or springy to completely fireform to the shape of the chamber, in which event the greater stretching of the case's thin side will cause it to develop a curve along the length of its body. These "banana" cases cannot hold a bullet aligned with and centered in the bore, undercutting the effectiveness of the handloader's careful case preparation.</p><p></p><p><img src="http://www.neconos.com/NEWDIAL2.JPG" alt="" class="fr-fic fr-dii fr-draggable " style="" /></p></blockquote><p></p>
[QUOTE="bigedp51, post: 1441142, member: 28965"] The last time you said you were going to put me on your ignore list and you didn't. And you do not have to explain anything to me because you are a condescending know it all. Do you actually think you are the only one in the world who knows how to reload. Stick to making muzzle breaks and stop trying to dominate this forum. P.S. Whidden custom dies doesn't make neck sizing dies, because competitive shooters no longer neck size. And your vast knowledge is truly amazing....................... [B]NECO CONCENTRICITY, WALL THICKNESS AND RUNOUT GAUGE [URL]http://www.neconos.com/details.htm[/URL][/B] Also referred to as "The Case Gauge," this item is designed to measure: [COLOR=#ff0000][B]1) The curved "banana" shape of the cartridge case;[/B][/COLOR] 2) The relative wall thickness variation of a cartridge case; 3) The cartridge case head out-of-squareness; 4) Individual Bullets - out-of-round "egg shape" and/or curved "banana" shape (excepting very small bullets); 5) The seated bullet and cartridge runout of loaded rounds. The accuracy of any firearm is determined -- and limited -- by the quality of the ammunition shot in it. The effect of imperfections in ammunition is cumulative; each flaw adds to the influence of all others. Precision shooters spend much time and effort "uniforming" cartridge cases, using advanced techniques to eliminate variation. Yet until recently, one of the most important of these variations has not been susceptible to detection by any device readily available to marksmen. [B]Normal manufacturing tolerances cause brass cartridge cases to vary in wall thickness around the circumference of their bodies. Under the stress of firing, a case with such variation stretches more readily along its thin side, transferring more pressure to the bolt face at that point and introducing an unbalanced force which contributes to bolt whip and vibration of the barreled action in its bedding.[/B] This whip and vibration varies from one shot to the next as cartridges are fired with their thin sides randomly oriented at different angles, causing reduced accuracy. The problem is made even worse if the brass is too hard or springy to completely fireform to the shape of the chamber, in which event the greater stretching of the case's thin side will cause it to develop a curve along the length of its body. These "banana" cases cannot hold a bullet aligned with and centered in the bore, undercutting the effectiveness of the handloader's careful case preparation. [IMG]http://www.neconos.com/NEWDIAL2.JPG[/IMG] [/QUOTE]
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Concentricity .. how important?
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