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Rifles, Reloading, Optics, Equipment
Reloading
How do you straighten runout?
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<blockquote data-quote="Bart B" data-source="post: 492177" data-attributes="member: 5302"><p>I don't like any of the cartridge spinners on the market. None of them measure runout based on how the case fits the chamber. Regarding your "small cylinder into a larger round hole," if that means case neck in chamber neck, the case neck does center in the chamber neck when the round's fired; read on.</p><p></p><p>Made my own cartridge spinner that has two places to support the round in V blocks exactly the same way it fits the chamber. </p><p></p><p>One V block at the back at the pressure ring, about 1/4th inch in front of the case head on rimless bottleneck cases or just in front of the belt on those kinds where the extractor holds it against the chamber wall with the round in the rifle. </p><p></p><p>The other V block's mid point on the shoulder as this is where the case centers at the front when it's fired. With the angle of both case and chamber shoulder being the same, the case perfectly centers in the chamber at it's front end.</p><p></p><p>My dial indicator's on the bullet ogive about 1/10th inch back from its tip. It doesn't matter if the case diameter at its pressure ring's a thousandth or two smaller than chamber diameter at that point. Every round will be oriented exactly the same for each shot. Even a 1/1000th spread in pressure ring diameter is meaningless.</p></blockquote><p></p>
[QUOTE="Bart B, post: 492177, member: 5302"] I don't like any of the cartridge spinners on the market. None of them measure runout based on how the case fits the chamber. Regarding your "small cylinder into a larger round hole," if that means case neck in chamber neck, the case neck does center in the chamber neck when the round's fired; read on. Made my own cartridge spinner that has two places to support the round in V blocks exactly the same way it fits the chamber. One V block at the back at the pressure ring, about 1/4th inch in front of the case head on rimless bottleneck cases or just in front of the belt on those kinds where the extractor holds it against the chamber wall with the round in the rifle. The other V block's mid point on the shoulder as this is where the case centers at the front when it's fired. With the angle of both case and chamber shoulder being the same, the case perfectly centers in the chamber at it's front end. My dial indicator's on the bullet ogive about 1/10th inch back from its tip. It doesn't matter if the case diameter at its pressure ring's a thousandth or two smaller than chamber diameter at that point. Every round will be oriented exactly the same for each shot. Even a 1/1000th spread in pressure ring diameter is meaningless. [/QUOTE]
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How do you straighten runout?
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