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Rifles, Reloading, Optics, Equipment
Reloading
Bullet runout?
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<blockquote data-quote="Bart B" data-source="post: 789602" data-attributes="member: 5302"><p>I'm convinced that minimal bullet runout is best attained by full length sizing fired bottleneck cases in dies without expander balls but with necks about2 thousandths smaller than a loaded round's neck diameter. Don't set the fired case shoulder back more than 2 thousandths. This centers the sized case neck best on the sized case shoulder and causes minimal neck bending from bullet forces on the unsupported case neck when seating bullets. With cases so sized, most any bullet seater will end up with bullet runout less than 3 thousandths which is good enough for no worse than 3" groups at 600 yards with good bullets, powder charges in great barrels.</p><p></p><p>This is for the .308 Win case or any bottleneck case headspacing on its shoulcer; runout should not be more than 1% of bullet diameter.</p><p></p><p>If your runout tool does not use the case shoulder at about mid point on it for the front reference, then bullet runout sill be effected by the out of round condition of the case body or the case neck's center offset from the shoulder's center reference. It's the case shoulder that centers the cartridge in the chamber shoulder when the round's fired; the case neck free floats in the chamber neck and touches nothing unless it's off center on the case shoulder.</p></blockquote><p></p>
[QUOTE="Bart B, post: 789602, member: 5302"] I'm convinced that minimal bullet runout is best attained by full length sizing fired bottleneck cases in dies without expander balls but with necks about2 thousandths smaller than a loaded round's neck diameter. Don't set the fired case shoulder back more than 2 thousandths. This centers the sized case neck best on the sized case shoulder and causes minimal neck bending from bullet forces on the unsupported case neck when seating bullets. With cases so sized, most any bullet seater will end up with bullet runout less than 3 thousandths which is good enough for no worse than 3" groups at 600 yards with good bullets, powder charges in great barrels. This is for the .308 Win case or any bottleneck case headspacing on its shoulcer; runout should not be more than 1% of bullet diameter. If your runout tool does not use the case shoulder at about mid point on it for the front reference, then bullet runout sill be effected by the out of round condition of the case body or the case neck's center offset from the shoulder's center reference. It's the case shoulder that centers the cartridge in the chamber shoulder when the round's fired; the case neck free floats in the chamber neck and touches nothing unless it's off center on the case shoulder. [/QUOTE]
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Rifles, Reloading, Optics, Equipment
Reloading
Bullet runout?
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