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Rifles, Reloading, Optics, Equipment
Reloading
Brass Spring Back
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<blockquote data-quote="SidecarFlip" data-source="post: 887167" data-attributes="member: 39764"><p>Don't want to start an argument but, the crystalline structure of brass only changes with heat and not the heat of ignition because brass (like softer and more malleable copper) is a good conductor of heat, passing the heat of ignition passively to the chamber walls.</p><p> </p><p>The only time the crystalline structure is altered is when annealing and why it's so important to anneal with control (dwell time and temperature) and cool immediately (the main reason I would never practice the heat and tip over in the pan method or the spin in a drill and drop methods because you can't accurately control heating and dwell time manually.</p><p> </p><p>As the brass ages, that is, sits around for an extended time, it may surface oxidize (loose it's shine) but the crystalline structure remains inert and unmoving at normal temperatures (below 500 degrees (f). If any relaxation were to occur (and it should not), it would be so minute that it would be unnoticeable. Far as primers backing out, that has nothing to do with case hardness and everything to do with prep.</p><p> </p><p>if that were the case (changing metallurgy with age), none of the brass manufacturers would be able to offer quality brass for reloading.</p><p> </p><p>I have to side with JE Custom on this one and.....</p><p> </p><p>I'm in the metals business with a QS/ISO company btw.</p></blockquote><p></p>
[QUOTE="SidecarFlip, post: 887167, member: 39764"] Don't want to start an argument but, the crystalline structure of brass only changes with heat and not the heat of ignition because brass (like softer and more malleable copper) is a good conductor of heat, passing the heat of ignition passively to the chamber walls. The only time the crystalline structure is altered is when annealing and why it's so important to anneal with control (dwell time and temperature) and cool immediately (the main reason I would never practice the heat and tip over in the pan method or the spin in a drill and drop methods because you can't accurately control heating and dwell time manually. As the brass ages, that is, sits around for an extended time, it may surface oxidize (loose it's shine) but the crystalline structure remains inert and unmoving at normal temperatures (below 500 degrees (f). If any relaxation were to occur (and it should not), it would be so minute that it would be unnoticeable. Far as primers backing out, that has nothing to do with case hardness and everything to do with prep. if that were the case (changing metallurgy with age), none of the brass manufacturers would be able to offer quality brass for reloading. I have to side with JE Custom on this one and..... I'm in the metals business with a QS/ISO company btw. [/QUOTE]
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Brass Spring Back
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