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Rifles, Reloading, Optics, Equipment
Reloading
adjusting head space
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<blockquote data-quote="boomtube" data-source="post: 237246" data-attributes="member: 9215"><p>"Try to bump a minimal amount, not more than .003". Deprime the case, put the empty in the chamber. First remove firing pin if you can. If you feel hard resistance, turn your F/L die down a quarter of a turn at a time, keep resizing and turning down a quarter, until the case chambers with just a very small resistance."</p><p> </p><p>Gene, your idea is correct but your suggested adjustments to attain that .003" bump are off. Dies have 14 threads per inch. A quarter turn changes it a tad under .018". The .003" change you accurately suggest would be lost some six times in a single adjustment, moving the die a one quarter turn can take a case from not quite enough to way too much shoulder set back, aka excess headspace.</p><p> </p><p>My suggestion of a 1/16th turn covers almost .0045" thou, so even that is way more than would be ideal to attain a shoulder set-back of 2-3 thou. But it's closer! </p><p> </p><p>I move my size die in even more tiny increments once I'm within maybe 5-8 thou from where I want to be.</p><p>---------------------------------------------------------</p><p> </p><p>"...so there is a way to check (headspace) and how do I check it..."</p><p> </p><p>CVA, the clay should get you close, but why care? There are no tools to do that because few care. All we really need to know is how to resize our cases to fit our rifle. Even precision riflesmiths don't much care about the absolute figure, they only care if the chamber headspace is within the normal +/- specs. They confirm it with a simple, two item set of "go/no go" gages.</p></blockquote><p></p>
[QUOTE="boomtube, post: 237246, member: 9215"] "Try to bump a minimal amount, not more than .003". Deprime the case, put the empty in the chamber. First remove firing pin if you can. If you feel hard resistance, turn your F/L die down a quarter of a turn at a time, keep resizing and turning down a quarter, until the case chambers with just a very small resistance." Gene, your idea is correct but your suggested adjustments to attain that .003" bump are off. Dies have 14 threads per inch. A quarter turn changes it a tad under .018". The .003" change you accurately suggest would be lost some six times in a single adjustment, moving the die a one quarter turn can take a case from not quite enough to way too much shoulder set back, aka excess headspace. My suggestion of a 1/16th turn covers almost .0045" thou, so even that is way more than would be ideal to attain a shoulder set-back of 2-3 thou. But it's closer! I move my size die in even more tiny increments once I'm within maybe 5-8 thou from where I want to be. --------------------------------------------------------- "...so there is a way to check (headspace) and how do I check it..." CVA, the clay should get you close, but why care? There are no tools to do that because few care. All we really need to know is how to resize our cases to fit our rifle. Even precision riflesmiths don't much care about the absolute figure, they only care if the chamber headspace is within the normal +/- specs. They confirm it with a simple, two item set of "go/no go" gages. [/QUOTE]
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