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Rifles, Reloading, Optics, Equipment
Reloading
308 winchester brass life
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<blockquote data-quote="Bart B" data-source="post: 1138547" data-attributes="member: 5302"><p>Not according to 99% of the reloaders I've talked about such things. As well as my last conversation with several reloading die company folks and a SAAMI rep some years ago on that subject. Their consensus is that full length sizing reduces the outside dimensions of the full length of the case from their pressure ring to their mouth down a little bit but never to SAAMI minimum specs. If they did, each one would have to be at whatever inside dimensions for all sorts of brass properties as well as case wall thicknesses to get back to some dimension that's probably not where they were when new. Standard full length sizing dies don't size down fired cases from their head to just short of the pressure ring. From SAAMI's glossary:</p><p></p><p><em>RESIZING, FULL LENGTH</em></p><p><em>The operation of reforming a fired cartridge case to <strong>approximately</strong> its original dimensions.</em></p><p></p><p>None of my full length sizing dies reduce fired case outside dimensions to that of a new case. Close is as good as they get.</p><p></p><p>99% of all the reloaders I've discussed this with say partial full length sizing is sizing down "part" of the case neck and all of the body forward of the pressure ring; hence "partial" is the operative word in the term.</p><p></p><p>This falls into the same issue with the space between the bolt/breech face and case head when called "headspace." SAAMI and most others says it's "head clearance."</p></blockquote><p></p>
[QUOTE="Bart B, post: 1138547, member: 5302"] Not according to 99% of the reloaders I've talked about such things. As well as my last conversation with several reloading die company folks and a SAAMI rep some years ago on that subject. Their consensus is that full length sizing reduces the outside dimensions of the full length of the case from their pressure ring to their mouth down a little bit but never to SAAMI minimum specs. If they did, each one would have to be at whatever inside dimensions for all sorts of brass properties as well as case wall thicknesses to get back to some dimension that's probably not where they were when new. Standard full length sizing dies don't size down fired cases from their head to just short of the pressure ring. From SAAMI's glossary: [I]RESIZING, FULL LENGTH The operation of reforming a fired cartridge case to [B]approximately[/B] its original dimensions.[/I] None of my full length sizing dies reduce fired case outside dimensions to that of a new case. Close is as good as they get. 99% of all the reloaders I've discussed this with say partial full length sizing is sizing down "part" of the case neck and all of the body forward of the pressure ring; hence "partial" is the operative word in the term. This falls into the same issue with the space between the bolt/breech face and case head when called "headspace." SAAMI and most others says it's "head clearance." [/QUOTE]
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308 winchester brass life
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