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Rifles, Reloading, Optics, Equipment
Reloading
Expander ball fact or fiction
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<blockquote data-quote="bigedp51" data-source="post: 1211497" data-attributes="member: 28965"><p>In the Speer No.9 reloading manual there is a chapter on reloading ammunition to benchrest quality. It stated the biggest cause of neck runout was due to locking the expander down off center.</p><p></p><p>If you full length resize a case without the expander the resized case will be as straight and concentric as its going to be. If a expander is used and is off center it will pull the case necks off center.</p><p></p><p>A simple Redding case neck concentricity gauge will tell you a lot about the quality of your brass with a twist of the wrist.</p><p></p><p>And a runout gauge with tell you about the quality of of your resized brass and loaded ammunition.</p><p></p><p>I have used my Sinclair expander die to expand case necks, and I have used body dies with Lee collet dies. And in my opinion my Forster dies produce straight cases with the least amount of neck runout without having to size the cases in two steps.</p><p></p><p>So buy some quality brass and gauges to inspect your sized and loaded ammunition and see what works best for you. Just remember to lube the inside of your case necks and forget internet rumors about expanders.</p><p></p><p>Below from Whidden Gun Works.</p><p></p><p> <strong>"The non-bushing sizer die typically yields more concentric ammo in our experience. It also fully sizes the case neck fully to the shoulder for smoother functioning. Neck tension can only be determined by changing expander balls with the non-bushing die."</strong></p><p></p><p></p><p><u><u><a href="http://www.whiddengunworks.com/wp-content/uploads/2015/02/Bushing.NonBushingExplanation.pdf" target="_blank">http://www.whiddengunworks.com/wp-content/uploads/2015/02/Bushing.NonBushingExplanation.pdf</a></u></u></p></blockquote><p></p>
[QUOTE="bigedp51, post: 1211497, member: 28965"] In the Speer No.9 reloading manual there is a chapter on reloading ammunition to benchrest quality. It stated the biggest cause of neck runout was due to locking the expander down off center. If you full length resize a case without the expander the resized case will be as straight and concentric as its going to be. If a expander is used and is off center it will pull the case necks off center. A simple Redding case neck concentricity gauge will tell you a lot about the quality of your brass with a twist of the wrist. And a runout gauge with tell you about the quality of of your resized brass and loaded ammunition. I have used my Sinclair expander die to expand case necks, and I have used body dies with Lee collet dies. And in my opinion my Forster dies produce straight cases with the least amount of neck runout without having to size the cases in two steps. So buy some quality brass and gauges to inspect your sized and loaded ammunition and see what works best for you. Just remember to lube the inside of your case necks and forget internet rumors about expanders. Below from Whidden Gun Works. [B]"The non-bushing sizer die typically yields more concentric ammo in our experience. It also fully sizes the case neck fully to the shoulder for smoother functioning. Neck tension can only be determined by changing expander balls with the non-bushing die."[/B] [U][U][URL]http://www.whiddengunworks.com/wp-content/uploads/2015/02/Bushing.NonBushingExplanation.pdf[/URL][/U][/U] [/QUOTE]
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Expander ball fact or fiction
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