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Rifles, Reloading, Optics, Equipment
Reloading
Neck Tension Effect on Accuracy
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<blockquote data-quote="bigedp51" data-source="post: 1255188" data-attributes="member: 28965"><p>If the cartridge case does not have equal case wall thickness the thin side expands more when fired. And if you are spinning a egg shaped case with the body of the case in V-blocks the neck of the case and the bullet will show more runout than the bullet has. </p><p></p><p>On top of my statement above at German Salazars old website "The Riflemans Journal" the subject of warped brass and the base of the case not being square was covered in detail. </p><p></p><p>And since I read about the rat turd in the violin case at Mr. Salazars website first and repeated Kevin Thomas of team Lapua USA I will take their advice over yours. And Kiven Thomas worked in the Sierra ballistic test laboratory where all the ammunition was full length resized. </p><p>(Full length resizing = "The rat turd in the violin case") </p><p></p><p>I also find it amazing that someone developed a gauge to check for the very thing I posted about in my two postings.</p><p><strong><span style="font-family: 'Arial'"><span style="font-size: 10px"></span></span></strong></p><p><strong><span style="font-family: 'Arial'"><span style="font-size: 10px"></span></span></strong><span style="font-family: 'Arial'"><span style="font-size: 10px">Neco Concentricity</span></span> Gauge</p><p><u><u><u><u><u><u><u><u><u><a href="http://www.neconos.com/details.htm" target="_blank">NECO Product Descriptions</a></u></u></u></u></u></u></u></u></u></p><p></p><div style="text-align: left"><span style="font-family: 'Franklin Gothic Demi'"><span style="font-size: 10px"><span style="color: #0000FF">Also referred to as "The Case Gauge," this item is designed to measure:</span></span></span></div><p> <span style="font-family: 'Arial'"><span style="font-size: 10px"><span style="color: #0000FF">1) The curved "banana" shape of the cartridge case;</span></span></span></p><p> <span style="font-family: 'Arial'"><span style="font-size: 10px"><span style="color: #0000FF">2) The relative wall thickness variation of a cartridge case;</span></span></span></p><p><span style="font-family: 'Arial'"><span style="font-size: 10px"><span style="color: #0000FF"> 3) The cartridge case head out-of-squareness;</span></span></span></p><p> <span style="font-family: 'Arial'"><span style="font-size: 10px"><span style="color: #0000FF">4) Individual Bullets - out-of-round "egg shape" and/or </span></span></span></p><p> <span style="font-family: 'Arial'"><span style="font-size: 10px"><span style="color: #0000FF">curved "banana" shape (excepting very small bullets);</span></span></span></p><p><span style="font-family: 'Arial'"><span style="font-size: 10px"><span style="color: #0000FF"> 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.</span></span></span></p><p><span style="font-family: 'Arial'"><span style="font-size: 10px"><span style="color: #0000FF"></span></span></span></p><p><span style="font-family: 'Arial'"><span style="font-size: 10px"><span style="color: #0000FF"></span></span></span></p><p><span style="font-family: 'Arial'"><span style="font-size: 10px"><span style="color: #0000FF"></span></span></span>And at Accurateshooter.com they say the same thing...</p><p>The case body<strong> "must"</strong> be in alignment with its axis, <strong></strong></p><p><strong></strong></p><p><strong>Bullet Concentricity Basics — What You Need to Know</strong></p><p></p><p><u><u><u><u><u><a href="http://bulletin.accurateshooter.com/2016/05/bullet-concentricity-basics-what-you-need-to-know/" target="_blank">Bullet Concentricity Basics — What You Need to Know « Daily Bulletin</a></u></u></u></u></u></p></blockquote><p></p>
[QUOTE="bigedp51, post: 1255188, member: 28965"] If the cartridge case does not have equal case wall thickness the thin side expands more when fired. And if you are spinning a egg shaped case with the body of the case in V-blocks the neck of the case and the bullet will show more runout than the bullet has. On top of my statement above at German Salazars old website "The Riflemans Journal" the subject of warped brass and the base of the case not being square was covered in detail. And since I read about the rat turd in the violin case at Mr. Salazars website first and repeated Kevin Thomas of team Lapua USA I will take their advice over yours. And Kiven Thomas worked in the Sierra ballistic test laboratory where all the ammunition was full length resized. (Full length resizing = "The rat turd in the violin case") I also find it amazing that someone developed a gauge to check for the very thing I posted about in my two postings. [B][FONT=Arial][SIZE=2] [/SIZE][/FONT][/B][FONT=Arial][SIZE=2]Neco Concentricity[/SIZE][/FONT] Gauge [U][U][U][U][U][U][U][U][U][URL="http://www.neconos.com/details.htm"]NECO Product Descriptions[/URL][/U][/U][/U][/U][/U][/U][/U][/U][/U] [LEFT][FONT=Franklin Gothic Demi][SIZE=2][COLOR=#0000FF]Also referred to as "The Case Gauge," this item is designed to measure:[/COLOR][/SIZE][/FONT][/LEFT] [FONT=Arial][SIZE=2][COLOR=#0000FF]1) The curved "banana" shape of the cartridge case; 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. [/COLOR][/SIZE][/FONT]And at Accurateshooter.com they say the same thing... The case body[B] "must"[/B] be in alignment with its axis, [B] Bullet Concentricity Basics — What You Need to Know[/B] [U][U][U][U][U][URL="http://bulletin.accurateshooter.com/2016/05/bullet-concentricity-basics-what-you-need-to-know/"]Bullet Concentricity Basics — What You Need to Know « Daily Bulletin[/URL][/U][/U][/U][/U][/U] [/QUOTE]
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