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Rifles, Reloading, Optics, Equipment
Reloading
Neck tension and max bullet grip force
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<blockquote data-quote="QuietTexan" data-source="post: 2170190" data-attributes="member: 116181"><p>Just to loop that back to practical for a minute, what I'm reading here is that if someone wanted to mandrel size as the final step before seating, this would be a functional sizing process without excessive steps to test:</p><p></p><p>1. Bushing size at 0.001-0.003" smaller than as-fired</p><p>2. Mandrel expand to 0.0020"-0.0005" under caliber</p><p></p><p>Also there's the assumption you're doing this on quality brass that has less than 0.0015" variation with a neck thickness of 0.012-0.015".</p><p></p><p>With good measuring you could likely rule out certain combinations from the get go, ie (using 30 cal for a very contrived example) a 0.3075" mandrel won't actually expand 0.012" turned brass sized with a .337" bushing because the neck won't have been sized down enough to touch the mandrel. You'd need a 0.331" bushing to get that brass tight enough for a mandrel to touch it.... and a shrink to help you figure out with why you have such thin necks in such a loose chamber.</p><p></p><p>21st sells mandrels in 0.0005" increments:</p><p>[URL unfurl="true"]https://21stcenturyinnovation.com/buy-online/ols/products/caliber-specific-expander-mandrel[/URL]</p><p></p><p>Then for someone who wants to jostle the cartridges and hunt with these very delicately sized rounds, use an FCD as a final tune.</p></blockquote><p></p>
[QUOTE="QuietTexan, post: 2170190, member: 116181"] Just to loop that back to practical for a minute, what I'm reading here is that if someone wanted to mandrel size as the final step before seating, this would be a functional sizing process without excessive steps to test: 1. Bushing size at 0.001-0.003" smaller than as-fired 2. Mandrel expand to 0.0020"-0.0005" under caliber Also there's the assumption you're doing this on quality brass that has less than 0.0015" variation with a neck thickness of 0.012-0.015". With good measuring you could likely rule out certain combinations from the get go, ie (using 30 cal for a very contrived example) a 0.3075" mandrel won't actually expand 0.012" turned brass sized with a .337" bushing because the neck won't have been sized down enough to touch the mandrel. You'd need a 0.331" bushing to get that brass tight enough for a mandrel to touch it.... and a shrink to help you figure out with why you have such thin necks in such a loose chamber. 21st sells mandrels in 0.0005" increments: [URL unfurl="true"]https://21stcenturyinnovation.com/buy-online/ols/products/caliber-specific-expander-mandrel[/URL] Then for someone who wants to jostle the cartridges and hunt with these very delicately sized rounds, use an FCD as a final tune. [/QUOTE]
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Neck tension and max bullet grip force
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