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Rifles, Reloading, Optics, Equipment
Reloading
Measuring Die Neck Diameter without Pin Gauges?
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<blockquote data-quote="DrSteve" data-source="post: 2109919" data-attributes="member: 114341"><p>I contacted RCBS recently because I couldn't find any published specs on their full-length sizing die neck diameters. They were kind enough to provide the following info:</p><p></p><p>6.5 Creedmoor .283 +- .002"</p><p>270 Winchester .298 +- .002"</p><p>7mm-08 .303 +- .002"</p><p></p><p>I was surprised RCBS does not hold them to tighter tolerances. I want to try using them without an expander and a .004" swing could make a significant difference on neck tension. There is a set of pin gauges on Amazon for $120, but that's alot of $$$ for an old retired guy. I know Forster will hone to tight tolerances, but I already have these RCBS dies.</p><p></p><p>I have a caliper and a ball micrometer, but no inside micrometer.</p><p></p><p>I thought maybe I could size brass without the expander ball and subtract .001" for springback. Would that give me a close estimate of the die's neck diameter?</p></blockquote><p></p>
[QUOTE="DrSteve, post: 2109919, member: 114341"] I contacted RCBS recently because I couldn't find any published specs on their full-length sizing die neck diameters. They were kind enough to provide the following info: 6.5 Creedmoor .283 +- .002" 270 Winchester .298 +- .002" 7mm-08 .303 +- .002" I was surprised RCBS does not hold them to tighter tolerances. I want to try using them without an expander and a .004" swing could make a significant difference on neck tension. There is a set of pin gauges on Amazon for $120, but that's alot of $$$ for an old retired guy. I know Forster will hone to tight tolerances, but I already have these RCBS dies. I have a caliper and a ball micrometer, but no inside micrometer. I thought maybe I could size brass without the expander ball and subtract .001" for springback. Would that give me a close estimate of the die's neck diameter? [/QUOTE]
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Measuring Die Neck Diameter without Pin Gauges?
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