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Rifles, Reloading, Optics, Equipment
Reloading
cases streatching - headspace?
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<blockquote data-quote="Bart B" data-source="post: 840476" data-attributes="member: 5302"><p>Rick, what you say is true.</p><p></p><p>All of which is why one should clean all the case lube off their cases after sizing them.</p><p></p><p>And don't polish cases to a mirror finish.</p><p></p><p>Have normal reamed chambers made; don't polish them bright and shiny.</p><p></p><p>The more thrust the case head has on the bolt face, the more force there is applied to the bolt's locking lugs.</p><p></p><p>There's an accuracy issue, too. If the bolt face ain't square with the chamber axis, previously fired cases from it will have their heads flattened to about the same angle. When both case and face high points align with each other when the case head slams against the bolt face, that off-axis force causes the barrel to whip in that direction. Shots don't go where they're aimed. Although this amounts to no more than 1/3 to 2/3 MOA error at most, that's enough to cause some folks to wonder why their loads don't shoot very accurate.</p></blockquote><p></p>
[QUOTE="Bart B, post: 840476, member: 5302"] Rick, what you say is true. All of which is why one should clean all the case lube off their cases after sizing them. And don't polish cases to a mirror finish. Have normal reamed chambers made; don't polish them bright and shiny. The more thrust the case head has on the bolt face, the more force there is applied to the bolt's locking lugs. There's an accuracy issue, too. If the bolt face ain't square with the chamber axis, previously fired cases from it will have their heads flattened to about the same angle. When both case and face high points align with each other when the case head slams against the bolt face, that off-axis force causes the barrel to whip in that direction. Shots don't go where they're aimed. Although this amounts to no more than 1/3 to 2/3 MOA error at most, that's enough to cause some folks to wonder why their loads don't shoot very accurate. [/QUOTE]
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Reloading
cases streatching - headspace?
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