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Rifles, Reloading, Optics, Equipment
Rifles, Bullets, Barrels & Ballistics
Full Length or Neck Only; What's Best Resizing for Accuracy?
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<blockquote data-quote="Bart B" data-source="post: 1816200" data-attributes="member: 5302"><p>Full length size the fired case (in a gelded die without an expander ball) setting its shoulder back a thousandth or two, reducing body diameters a thousandth or two and reducing the neck diameter so its inside diameter is a thousandth smaller than bullet diameter. Now the neck axis is aligned with the shoulder and body axis.</p><p></p><p>Seated bullets don't need to touch the rifling lands in the throat. They'll be well aligned with the bore axis when the round fires then travel bullet jump distance to engage the rifling. Case shoulder is hard pressed into and well centered in the chamber shoulder when the round fires.</p><p></p><p>Sierra Bullets championed this process in the late 1950's and competitive shooters soon moved away from neck only resizing. Their largest test groups got much smaller. Their smallest test groups stayed about the same size.</p></blockquote><p></p>
[QUOTE="Bart B, post: 1816200, member: 5302"] Full length size the fired case (in a gelded die without an expander ball) setting its shoulder back a thousandth or two, reducing body diameters a thousandth or two and reducing the neck diameter so its inside diameter is a thousandth smaller than bullet diameter. Now the neck axis is aligned with the shoulder and body axis. Seated bullets don't need to touch the rifling lands in the throat. They'll be well aligned with the bore axis when the round fires then travel bullet jump distance to engage the rifling. Case shoulder is hard pressed into and well centered in the chamber shoulder when the round fires. Sierra Bullets championed this process in the late 1950's and competitive shooters soon moved away from neck only resizing. Their largest test groups got much smaller. Their smallest test groups stayed about the same size. [/QUOTE]
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Rifles, Reloading, Optics, Equipment
Rifles, Bullets, Barrels & Ballistics
Full Length or Neck Only; What's Best Resizing for Accuracy?
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