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Rifles, Reloading, Optics, Equipment
Reloading
375H&H, 250 Sierra, R17, velocity results
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<blockquote data-quote="gte901m" data-source="post: 1377234" data-attributes="member: 80740"><p>Even on belted cases, I measure brass from the base to the shoulder with a Hornady comparator bushing and calipers (what would be called headspace on a non-belted, bottleneck case).</p><p></p><p>Fired brass was 25 thou longer than my new brass. Instead of just letting the new brass stretch 25 thou on the first firing, I expand the neck with a .416 expander (which on a 375HH creates an almost straight wall case) and full length size to create a new shoulder ~20 thou forward of the original shoulder (must adjust sizing die w/ comparator measurements to get correct base to shoulder distance). Most call this creating a "false shoulder".</p><p></p><p>Why? Stretching 25 thou during one firing could stretch the brass closer towards the case head, and lead to case head separation (short brass life). </p><p></p><p>You can bend a paper clip a hundred times before it breaks if you barely bend it, but you can only bend it a few times if you bend it 90 degrees each time. Not the best analogy, but close enough.</p><p></p><p>Hope that helps.</p></blockquote><p></p>
[QUOTE="gte901m, post: 1377234, member: 80740"] Even on belted cases, I measure brass from the base to the shoulder with a Hornady comparator bushing and calipers (what would be called headspace on a non-belted, bottleneck case). Fired brass was 25 thou longer than my new brass. Instead of just letting the new brass stretch 25 thou on the first firing, I expand the neck with a .416 expander (which on a 375HH creates an almost straight wall case) and full length size to create a new shoulder ~20 thou forward of the original shoulder (must adjust sizing die w/ comparator measurements to get correct base to shoulder distance). Most call this creating a "false shoulder". Why? Stretching 25 thou during one firing could stretch the brass closer towards the case head, and lead to case head separation (short brass life). You can bend a paper clip a hundred times before it breaks if you barely bend it, but you can only bend it a few times if you bend it 90 degrees each time. Not the best analogy, but close enough. Hope that helps. [/QUOTE]
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Rifles, Reloading, Optics, Equipment
Reloading
375H&H, 250 Sierra, R17, velocity results
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