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Rifles, Reloading, Optics, Equipment
Reloading
full length resizing
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<blockquote data-quote="SidecarFlip" data-source="post: 931230" data-attributes="member: 39764"><p>SOP for me. You'll find all my dies to be ground on the base and/or the shellholder. Issue is, the base and/or shellholder has to be ground square to the ram axis or they will contact in a skewed manner. No big deal here, I fixture them in a surface grinder and grind them that way. Just a couple thousands, no more (depending on the shoulder bump according to my headspace gage.</p><p> </p><p>If the die is manufactured to SAMMI specification, an interference fit between the die base and the shellholder will almost always bump the shoulder back too far and overwork the brass and in the interests of longevity of cases, you want to bump as little as possible. You have to determine the headspace required and then bump back a couple thousands, no more. The easiest way is to use a fired case and measure the shoulder datum with a repeatable fixture. I use a Hornady gage myself. However, keep in mind that each chamber is different, just like fingerprints, so the fired case must come from the chamber you want to size for....</p><p> </p><p>All dies will set back the shoulder on a bottleneck case when resizing, don't matter if the die is a fixed cavity or a bushing style, bushing style being a better choice for neck tension and you can remove the bushing and expander ball for bumping without sizing.</p><p> </p><p>I run both ways depending on caliber and end use. Smaller calibers like 223 aren't so critical as the internal dimensions are smaller so a fixed cavity will work fine. On larger calibers (3 series and larger), bushing dies are the way to go because the internal dimensions of the die are larger and more room for error.</p></blockquote><p></p>
[QUOTE="SidecarFlip, post: 931230, member: 39764"] SOP for me. You'll find all my dies to be ground on the base and/or the shellholder. Issue is, the base and/or shellholder has to be ground square to the ram axis or they will contact in a skewed manner. No big deal here, I fixture them in a surface grinder and grind them that way. Just a couple thousands, no more (depending on the shoulder bump according to my headspace gage. If the die is manufactured to SAMMI specification, an interference fit between the die base and the shellholder will almost always bump the shoulder back too far and overwork the brass and in the interests of longevity of cases, you want to bump as little as possible. You have to determine the headspace required and then bump back a couple thousands, no more. The easiest way is to use a fired case and measure the shoulder datum with a repeatable fixture. I use a Hornady gage myself. However, keep in mind that each chamber is different, just like fingerprints, so the fired case must come from the chamber you want to size for.... All dies will set back the shoulder on a bottleneck case when resizing, don't matter if the die is a fixed cavity or a bushing style, bushing style being a better choice for neck tension and you can remove the bushing and expander ball for bumping without sizing. I run both ways depending on caliber and end use. Smaller calibers like 223 aren't so critical as the internal dimensions are smaller so a fixed cavity will work fine. On larger calibers (3 series and larger), bushing dies are the way to go because the internal dimensions of the die are larger and more room for error. [/QUOTE]
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Rifles, Reloading, Optics, Equipment
Reloading
full length resizing
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