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Rifles, Reloading, Optics, Equipment
Reloading
Why such varying headspace measurement on fired cases
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<blockquote data-quote="Mikecr" data-source="post: 1683885" data-attributes="member: 1521"><p>bigedp51 provided method will give you headspace, while using a flat enough primer, I like it but you shouldn't bump from that. You should fully fire-form cases, with no body sizing, before 1st bumping/die setup -from the interference fit with your chamber at that point. This, because new shoulders move both forward AND change shoulder angle (affecting headspace tool datum and case fit). A lot of times necks will pull back from chamber end due to shoulder angle forming(messing with your trim length).</p><p>There is just no substitution for the local forming to your particular chamber.</p><p></p><p>It's also unlikely to fully form with a single shot. And there will be some HS variance from case to case for the life of the brass. With this we should check HS every case, every reload. No assumptions.</p></blockquote><p></p>
[QUOTE="Mikecr, post: 1683885, member: 1521"] bigedp51 provided method will give you headspace, while using a flat enough primer, I like it but you shouldn't bump from that. You should fully fire-form cases, with no body sizing, before 1st bumping/die setup -from the interference fit with your chamber at that point. This, because new shoulders move both forward AND change shoulder angle (affecting headspace tool datum and case fit). A lot of times necks will pull back from chamber end due to shoulder angle forming(messing with your trim length). There is just no substitution for the local forming to your particular chamber. It's also unlikely to fully form with a single shot. And there will be some HS variance from case to case for the life of the brass. With this we should check HS every case, every reload. No assumptions. [/QUOTE]
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Reloading
Why such varying headspace measurement on fired cases
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