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Rifles, Reloading, Optics, Equipment
Rifles, Bullets, Barrels & Ballistics
Case head separation with new Browning X- bolt 300 win mag.
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<blockquote data-quote="Pdvdh" data-source="post: 2888652" data-attributes="member: 4191"><p>What you're saying is true for a beltless cartridge, that headpaces off the shoulder. Yes, the case stretching you refer to largely occurs at this web location on a beltless casing that headspaces off its shoulder, if headspace is excessive.</p><p></p><p>On a belted casing, properly headspaced on its belt, the stretching occurs almost entirely in the shoulder area. Not at the case web.</p><p></p><p>The OP says he's seeing impending case head separation with once-fired and twice-fired cases. On a belted cartridge properly headspaced against the forward belt, the cartridge case head is held against the bolt face. The case head can't push back toward the bolt face when chamber pressure builds. So the case shoulder blows forward to fill the void space between the case shoulder and the chamber shoulder. The case stretch occurs in the shoulder, which is the most malleable, thinner, and weaker portion of the casing.</p><p></p><p>In order to stretch the case wall significantly at the web, where these cases are separating, the case head has to move back toward the bolt face after the casing side walls have gripped the chamber wall tightly, as internal case pressure climbs.</p><p></p><p>I have only seen belted cases exhibit impending separations at this location if headspace on the belt is excessive, and after multiple firings. Not in 1 or 2 firings.</p><p></p><p>I'm afraid I agree with with MagnumManiac on this. Who was a practicing gunsmith for 40 years, and exceptionally proud of it.</p></blockquote><p></p>
[QUOTE="Pdvdh, post: 2888652, member: 4191"] What you're saying is true for a beltless cartridge, that headpaces off the shoulder. Yes, the case stretching you refer to largely occurs at this web location on a beltless casing that headspaces off its shoulder, if headspace is excessive. On a belted casing, properly headspaced on its belt, the stretching occurs almost entirely in the shoulder area. Not at the case web. The OP says he's seeing impending case head separation with once-fired and twice-fired cases. On a belted cartridge properly headspaced against the forward belt, the cartridge case head is held against the bolt face. The case head can't push back toward the bolt face when chamber pressure builds. So the case shoulder blows forward to fill the void space between the case shoulder and the chamber shoulder. The case stretch occurs in the shoulder, which is the most malleable, thinner, and weaker portion of the casing. In order to stretch the case wall significantly at the web, where these cases are separating, the case head has to move back toward the bolt face after the casing side walls have gripped the chamber wall tightly, as internal case pressure climbs. I have only seen belted cases exhibit impending separations at this location if headspace on the belt is excessive, and after multiple firings. Not in 1 or 2 firings. I'm afraid I agree with with MagnumManiac on this. Who was a practicing gunsmith for 40 years, and exceptionally proud of it. [/QUOTE]
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Rifles, Reloading, Optics, Equipment
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Case head separation with new Browning X- bolt 300 win mag.
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