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Rifles, Reloading, Optics, Equipment
Reloading
Chambered Round Alignment to Bore; Neck Sized vs Full Length Sized
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<blockquote data-quote="Bart B" data-source="post: 645622" data-attributes="member: 5302"><p>Yes, cases expand from their front end to the back end; thanks to case walls getting thinner from extractor rim to case mouth.</p><p></p><p>As only 269 psi of chamber pressure's needed to push a .308 diameter bullet out of the case neck when 20 pounds of force on the bullet's needed, there won't be much expansion of the case at that time. There's probably a microscopic amount of bullet's axis direction changing (whether or not the bullet's already into the rifling or not) while pressure builds up, but not much I would think. But a 6mm cartridge needs 431 psi to push out its bullet needing the same force to do it.</p></blockquote><p></p>
[QUOTE="Bart B, post: 645622, member: 5302"] Yes, cases expand from their front end to the back end; thanks to case walls getting thinner from extractor rim to case mouth. As only 269 psi of chamber pressure's needed to push a .308 diameter bullet out of the case neck when 20 pounds of force on the bullet's needed, there won't be much expansion of the case at that time. There's probably a microscopic amount of bullet's axis direction changing (whether or not the bullet's already into the rifling or not) while pressure builds up, but not much I would think. But a 6mm cartridge needs 431 psi to push out its bullet needing the same force to do it. [/QUOTE]
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Rifles, Reloading, Optics, Equipment
Reloading
Chambered Round Alignment to Bore; Neck Sized vs Full Length Sized
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