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Rifles, Reloading, Optics, Equipment
Reloading
Neck Tension Effect on Accuracy
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<blockquote data-quote="ShtrRdy" data-source="post: 1741865" data-attributes="member: 40852"><p>Thanks for kicking this thread up. I have been using an old Sinclair Concentricity Gauge. My thoughts on the V-block are that a case that has been fired should be very concentric on the outside due to the chambering reamer being rotated on an axis guided by a alignment pin.</p><p></p><p>I'd like to mention something I noticed recently when using a Redding Full Length Bushing die. This is for a .308 Win case. The fired case neck diameter is 0.344". I need to size it down to 0.335". I do this in two steps. First step takes it down to 0.340" and the second takes it down to 0.335". Measuring the runout at the neck on a fired case I see less than 0.0005" runout. After sizing down to 0.340" the runout is 0 to 0.001". Then sizing down to 0.335" the runout was frequently 0.004". During previous case prep sessions this step has resulted in runout less than 0.002". </p><p></p><p>What i found that I could do is to first just start the neck of the case into the bushing, then pull it back out, and then go the full stroke. This would result in less than 0.002" runout.</p></blockquote><p></p>
[QUOTE="ShtrRdy, post: 1741865, member: 40852"] Thanks for kicking this thread up. I have been using an old Sinclair Concentricity Gauge. My thoughts on the V-block are that a case that has been fired should be very concentric on the outside due to the chambering reamer being rotated on an axis guided by a alignment pin. I'd like to mention something I noticed recently when using a Redding Full Length Bushing die. This is for a .308 Win case. The fired case neck diameter is 0.344". I need to size it down to 0.335". I do this in two steps. First step takes it down to 0.340" and the second takes it down to 0.335". Measuring the runout at the neck on a fired case I see less than 0.0005" runout. After sizing down to 0.340" the runout is 0 to 0.001". Then sizing down to 0.335" the runout was frequently 0.004". During previous case prep sessions this step has resulted in runout less than 0.002". What i found that I could do is to first just start the neck of the case into the bushing, then pull it back out, and then go the full stroke. This would result in less than 0.002" runout. [/QUOTE]
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Rifles, Reloading, Optics, Equipment
Reloading
Neck Tension Effect on Accuracy
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