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Rifles, Reloading, Optics, Equipment
Reloading
Concentricity/Neck Turning/Culling Cases:
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<blockquote data-quote="wildcat westerner" data-source="post: 1645209" data-attributes="member: 21361"><p>****, hit the wrong button,</p><p>So, chamber neck diameter minus bullets' true dimension gives you the proper neck thickness, minus </p><p>.002 for safety. This figure is split in half (for each side of the neck). Thus a .308 bullet, with a case turned to .010 would measure .328 externally and the chamber neck size would be .330.</p><p>If you don't know your chambers' neck diameter, take a fired case with consistent neck thickness and measure the fired necks' diameter. With the springiness of brass needed for extraction, that fired neck diameter, plus.002 is your true chamber neck diameter.</p><p>As to turning necks: brass is now better than it used to be, in terms of neck thickness, but the "gold standard" for neck turning consistency is the orange "pumpkin" neck turner!</p><p>I have been fortunate to have set some worlds' records and know several people who have set a bunch more. The one big "secret" which was very closely held for years was switching the dial on the concentricity gauge from .000 to .0000. Then you got true concentricity which could be seen on a target at 1,000 yards!</p><p>WW</p></blockquote><p></p>
[QUOTE="wildcat westerner, post: 1645209, member: 21361"] ****, hit the wrong button, So, chamber neck diameter minus bullets' true dimension gives you the proper neck thickness, minus .002 for safety. This figure is split in half (for each side of the neck). Thus a .308 bullet, with a case turned to .010 would measure .328 externally and the chamber neck size would be .330. If you don't know your chambers' neck diameter, take a fired case with consistent neck thickness and measure the fired necks' diameter. With the springiness of brass needed for extraction, that fired neck diameter, plus.002 is your true chamber neck diameter. As to turning necks: brass is now better than it used to be, in terms of neck thickness, but the "gold standard" for neck turning consistency is the orange "pumpkin" neck turner! I have been fortunate to have set some worlds' records and know several people who have set a bunch more. The one big "secret" which was very closely held for years was switching the dial on the concentricity gauge from .000 to .0000. Then you got true concentricity which could be seen on a target at 1,000 yards! WW [/QUOTE]
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Rifles, Reloading, Optics, Equipment
Reloading
Concentricity/Neck Turning/Culling Cases:
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