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Rifles, Reloading, Optics, Equipment
Reloading
Mandrel as last step?
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<blockquote data-quote="MagnumManiac" data-source="post: 2732801" data-attributes="member: 10755"><p>Of course uneven neck thickness will expand very slightly differently, but we are talking ten thousands of an inch, not one thousands of an inch.</p><p>The time it takes is also a valuable number to know.</p><p>Light interference allows the bullet to engage the rifling earlier sealing the gap between the case mouth and chamber wall.</p><p>This changes start pressure and the node…so does using a dry bullet lube.</p><p>If the case is sloppy in the chamber, then erratic results occur between shots, as each case moves differently in the chamber.</p><p>Having pressure testing equipment has learnt me many things.</p><p>Tight neck chambers are actually detrimental to consistent bullet movement, .003" is ideal and trimming necks to a minimum of .014" is about perfect. Any thinner can cause erratic expansion.</p><p>Necks, and cases, are thinner on one side due to the drawing process, this doesn't change after you trim to get them the same, this continues through the life of the brass.</p><p>Anyway, this is the fundamental way to be consistent. Some fliers will for sure be caused because a case that you cannot measure will have expanded unequally.</p><p>Culling is the only answer.</p><p></p><p>Cheers.</p></blockquote><p></p>
[QUOTE="MagnumManiac, post: 2732801, member: 10755"] Of course uneven neck thickness will expand very slightly differently, but we are talking ten thousands of an inch, not one thousands of an inch. The time it takes is also a valuable number to know. Light interference allows the bullet to engage the rifling earlier sealing the gap between the case mouth and chamber wall. This changes start pressure and the node…so does using a dry bullet lube. If the case is sloppy in the chamber, then erratic results occur between shots, as each case moves differently in the chamber. Having pressure testing equipment has learnt me many things. Tight neck chambers are actually detrimental to consistent bullet movement, .003” is ideal and trimming necks to a minimum of .014” is about perfect. Any thinner can cause erratic expansion. Necks, and cases, are thinner on one side due to the drawing process, this doesn’t change after you trim to get them the same, this continues through the life of the brass. Anyway, this is the fundamental way to be consistent. Some fliers will for sure be caused because a case that you cannot measure will have expanded unequally. Culling is the only answer. Cheers. [/QUOTE]
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Rifles, Reloading, Optics, Equipment
Reloading
Mandrel as last step?
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