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Rifles, Reloading, Optics, Equipment
Reloading
Polishing a body die?
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<blockquote data-quote="Bart B" data-source="post: 838516" data-attributes="member: 5302"><p>That's what I've seen firing .222 Rem., .220.250 and .243 primed empty cases then checking for shoulder setback from pin impact. </p><p></p><p>Hatcher, in his tests with .30-06 cartridges, found hard closing of an M1903 bolt on them would set the shoulder back 6 thousandths. Check this link:</p><p></p><p><a href="http://books.google.ca/books?id=yESNUKSg5aMC&pg=PA244&lpg=PA244&dq=hatcher+.006&source=bl&ots=AACtVE_u7f&sig=E6nt_u1rRkAxZ4Vtx-BSr8yDg_M&hl=en&sa=X&ei=Z9QMUpC2O6OEygHdwIHgDQ&ved=0CCwQ6AEwAA#v=onepage&q=hatcher%20.006&f=false" target="_blank">Hatcher's Notebook - Julian S. Hatcher - Google Books</a></p><p></p><p>Other cases I've tested with less shoulder surface and shallower angles, i.e. those based on the .30-06 and .308 Win case 30 caliber and larger all showed some shoulder setback. Nickel plated .308 Win cases had more shoulder setback than brass ones. The .358 Win primed cases had the most shoulder setback.</p><p></p><p>The double rifle .375 Super Flanged Magnum developed around 1900 was made into a rimless case for trials in bolt action rifles. Firing pin impact on its small area, 17 degree shoulder from Mauser actions was enough to drive it forward setting the shoulder back enough to start causing incipient head separation. So they put a rimless belt on it in 1912 so that belt would control headspacing and prevent shoulder setback from firing pin impact as well as enable flawless feeding from box magaznies. That was the birth of the .375 H&H Magnum. Other rimmed cases also had belts added in the same time frame to control headspace in bolt action rifles.</p></blockquote><p></p>
[QUOTE="Bart B, post: 838516, member: 5302"] That's what I've seen firing .222 Rem., .220.250 and .243 primed empty cases then checking for shoulder setback from pin impact. Hatcher, in his tests with .30-06 cartridges, found hard closing of an M1903 bolt on them would set the shoulder back 6 thousandths. Check this link: [url=http://books.google.ca/books?id=yESNUKSg5aMC&pg=PA244&lpg=PA244&dq=hatcher+.006&source=bl&ots=AACtVE_u7f&sig=E6nt_u1rRkAxZ4Vtx-BSr8yDg_M&hl=en&sa=X&ei=Z9QMUpC2O6OEygHdwIHgDQ&ved=0CCwQ6AEwAA#v=onepage&q=hatcher%20.006&f=false]Hatcher's Notebook - Julian S. Hatcher - Google Books[/url] Other cases I've tested with less shoulder surface and shallower angles, i.e. those based on the .30-06 and .308 Win case 30 caliber and larger all showed some shoulder setback. Nickel plated .308 Win cases had more shoulder setback than brass ones. The .358 Win primed cases had the most shoulder setback. The double rifle .375 Super Flanged Magnum developed around 1900 was made into a rimless case for trials in bolt action rifles. Firing pin impact on its small area, 17 degree shoulder from Mauser actions was enough to drive it forward setting the shoulder back enough to start causing incipient head separation. So they put a rimless belt on it in 1912 so that belt would control headspacing and prevent shoulder setback from firing pin impact as well as enable flawless feeding from box magaznies. That was the birth of the .375 H&H Magnum. Other rimmed cases also had belts added in the same time frame to control headspace in bolt action rifles. [/QUOTE]
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