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Rifles, Reloading, Optics, Equipment
Reloading
Shoulder bump problem? Not far enough?
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<blockquote data-quote="Bart B" data-source="post: 867542" data-attributes="member: 5302"><p>I don't think so. Especially if the chamber shoulder's at the long end of some specs.</p><p></p><p>A 90 degree turn on the die moves it about .018". But that'll probably make the shell holder go hard against the die's bottom. </p><p></p><p>Most RCBS dies are set to bump rimless bottleneck case shoulder back to about minimum SAAMI case specs for head to shoulder dimension. On my .308 Win RCBS dies, a GO 1.630" headspace gauge head sticks out of the die's bottom .130". A fired case with 1.630" headspace sized with the .125" high shellholder touching the die's bottom will set its shoulder back .005" while the case is full into the die, then after the case comes out of the die, the shoulder will spring back a thousandth or two. It's only about .003" to .004" set back from its fired position; almost exactly SAAMI specs for minimum case headspace of 1.627".</p><p></p><p>Any fired case with greater headspace will end up with the same headspace regardless of where its shoulder was before being sized. If the fired rimless bottleneck case came from a maximum headspace chamber, it's shoulder may well get set back .010" to .015".</p></blockquote><p></p>
[QUOTE="Bart B, post: 867542, member: 5302"] I don't think so. Especially if the chamber shoulder's at the long end of some specs. A 90 degree turn on the die moves it about .018". But that'll probably make the shell holder go hard against the die's bottom. Most RCBS dies are set to bump rimless bottleneck case shoulder back to about minimum SAAMI case specs for head to shoulder dimension. On my .308 Win RCBS dies, a GO 1.630" headspace gauge head sticks out of the die's bottom .130". A fired case with 1.630" headspace sized with the .125" high shellholder touching the die's bottom will set its shoulder back .005" while the case is full into the die, then after the case comes out of the die, the shoulder will spring back a thousandth or two. It's only about .003" to .004" set back from its fired position; almost exactly SAAMI specs for minimum case headspace of 1.627". Any fired case with greater headspace will end up with the same headspace regardless of where its shoulder was before being sized. If the fired rimless bottleneck case came from a maximum headspace chamber, it's shoulder may well get set back .010" to .015". [/QUOTE]
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Rifles, Reloading, Optics, Equipment
Reloading
Shoulder bump problem? Not far enough?
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