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Rifles, Reloading, Optics, Equipment
Reloading
Ugly extreme spread........now what ?
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<blockquote data-quote="Howland" data-source="post: 1672794" data-attributes="member: 103509"><p>This right here.</p><p></p><p>Unless I missed it, you didn't mention whether you are using a neck bushing to control tension and what size or using the expander ball that came with the die set or a custom mandrel.</p><p></p><p>I had always just used the expander ball (since I repented of my LCD only ways <img src="data:image/gif;base64,R0lGODlhAQABAIAAAAAAAP///yH5BAEAAAAALAAAAAABAAEAAAIBRAA7" class="smilie smilie--sprite smilie--sprite11" alt=":rolleyes:" title="Roll Eyes :rolleyes:" loading="lazy" data-shortname=":rolleyes:" />) and had good results until my current project. If you think ES of 86 is bad, mine was 240+!</p><p></p><p>But it was only with a very low charge weight (the most accurate, otherwise I wouldn't be messing around there) and only until I tried the deepest seating depth batch, then it was normal again. My theory is that there wasn't enough neck tension to generate enough resistance to generate the pressure for consistent ignition.</p><p></p><p>By trial and error using multiple bushings and mandrels, this one just likes .003" interference fit with that neck wall thickness and degree of work hardening. ES is much more acceptable.</p><p></p><p>FWIW, I would not give much credence to an SD calculated from a single sample size of ten. I would start by taking a hard look at your neck sizing to see where you might get greater uniformity. The observed ES you are seeing is real.</p></blockquote><p></p>
[QUOTE="Howland, post: 1672794, member: 103509"] This right here. Unless I missed it, you didn't mention whether you are using a neck bushing to control tension and what size or using the expander ball that came with the die set or a custom mandrel. I had always just used the expander ball (since I repented of my LCD only ways :rolleyes:) and had good results until my current project. If you think ES of 86 is bad, mine was 240+! But it was only with a very low charge weight (the most accurate, otherwise I wouldn't be messing around there) and only until I tried the deepest seating depth batch, then it was normal again. My theory is that there wasn't enough neck tension to generate enough resistance to generate the pressure for consistent ignition. By trial and error using multiple bushings and mandrels, this one just likes .003" interference fit with that neck wall thickness and degree of work hardening. ES is much more acceptable. FWIW, I would not give much credence to an SD calculated from a single sample size of ten. I would start by taking a hard look at your neck sizing to see where you might get greater uniformity. The observed ES you are seeing is real. [/QUOTE]
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Reloading
Ugly extreme spread........now what ?
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