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Rifles, Reloading, Optics, Equipment
Reloading
Is it possible…
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<blockquote data-quote="Roninco" data-source="post: 2326584" data-attributes="member: 114195"><p>New brass is at it's smallest dimensions, both in diameter and length. This is often at or below SAAMI minimums and much less than chamber dimensions especially on a factory barrel. </p><p>Upon the first firing the brass diameter will first expand to the chamber body diameter. This can cause the case length to initially shorten. If additional pressure is available the case will then lengthen on the base to shoulder axis and subsequently "grow". If still more pressure remains the brass will flow past the shoulder and cause the neck length to increase. This is why case trimming may not be necessary until after several firings since the diameter and base to shoulder growth has already occurred. </p><p>So yes, once fired brass can be shorter than new brass. This is why caution is needed if adjusting the sizing die on only the first firing.</p></blockquote><p></p>
[QUOTE="Roninco, post: 2326584, member: 114195"] New brass is at it's smallest dimensions, both in diameter and length. This is often at or below SAAMI minimums and much less than chamber dimensions especially on a factory barrel. Upon the first firing the brass diameter will first expand to the chamber body diameter. This can cause the case length to initially shorten. If additional pressure is available the case will then lengthen on the base to shoulder axis and subsequently "grow". If still more pressure remains the brass will flow past the shoulder and cause the neck length to increase. This is why case trimming may not be necessary until after several firings since the diameter and base to shoulder growth has already occurred. So yes, once fired brass can be shorter than new brass. This is why caution is needed if adjusting the sizing die on only the first firing. [/QUOTE]
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