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Rifles, Reloading, Optics, Equipment
Reloading
Case web expansion help
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<blockquote data-quote="bigedp51" data-source="post: 1315149" data-attributes="member: 28965"><p>Measuring base expansion just above the extractor groove tells you how much pressure that type and brand of case can take.</p><p></p><p>Example below, the thickness of the flash hole web adds radial strength to the base of the case.</p><p>Below the Lake City 5.56 case on the right has harder brass in the base and a thicker flash hole web. And I had 2005 dated factory loaded Federal .223/5.56 cases with over sized primer pockets after the first firing, and these Federal cases had thinner flash hole webs</p><p></p><p><img src="http://i.imgur.com/cYeTsDp.jpg" alt="" class="fr-fic fr-dii fr-draggable " style="" /></p><p></p><p>Below case flash hole web thickness with Federal having the thinnest flash hole web and the base expands more when fired.</p><p></p><p><img src="http://i.imgur.com/ohI86Bf.jpg" alt="" class="fr-fic fr-dii fr-draggable " style="" /></p><p></p><p>So again, measuring base expansion doesn't tell you the chamber pressure. "BUT" it does tell you how much pressure that caliber and brand of case can take.</p><p></p><p>Below the hardness of the brass in the base, the base wall thickness and how thick the flash hole web is governs how strong and how much pressure can take.</p><p></p><p></p><p></p><p><img src="http://i.imgur.com/IBJQA9p.gif" alt="" class="fr-fic fr-dii fr-draggable " style="" /></p><p>Measuring base expansion tells you the elastic limits of the brass. And similar to brass flowing into the ejector and exceeding the elastic limits of the brass.</p><p></p><p> <img src="http://i.imgur.com/KtO65uH.jpg" alt="" class="fr-fic fr-dii fr-draggable " style="" /></p><p></p><p></p><p><u><u><u><u><u><u><u><u><u><u><u><a href="http://www.hodgdonreloading.com/reloading-education/tips-and-tricks/simple-trick-monitoring-pressure-your-rifle-reloads" target="_blank">Simple Trick for Monitoring Pressure of Your Rifle Reloads | Hodgdon Reloading</a></u></u></u></u></u></u></u></u></u></u></u></p><p><u></u></p><p><u>To the OP, try another brand of case and look for cases built Ford Truck Tough. <img src="data:image/gif;base64,R0lGODlhAQABAIAAAAAAAP///yH5BAEAAAAALAAAAAABAAEAAAIBRAA7" class="smilie smilie--sprite smilie--sprite8" alt=":D" title="Big Grin :D" loading="lazy" data-shortname=":D" /></u></p><p><u></u></p></blockquote><p></p>
[QUOTE="bigedp51, post: 1315149, member: 28965"] Measuring base expansion just above the extractor groove tells you how much pressure that type and brand of case can take. Example below, the thickness of the flash hole web adds radial strength to the base of the case. Below the Lake City 5.56 case on the right has harder brass in the base and a thicker flash hole web. And I had 2005 dated factory loaded Federal .223/5.56 cases with over sized primer pockets after the first firing, and these Federal cases had thinner flash hole webs [IMG]http://i.imgur.com/cYeTsDp.jpg[/IMG] Below case flash hole web thickness with Federal having the thinnest flash hole web and the base expands more when fired. [IMG]http://i.imgur.com/ohI86Bf.jpg[/IMG] So again, measuring base expansion doesn't tell you the chamber pressure. "BUT" it does tell you how much pressure that caliber and brand of case can take. Below the hardness of the brass in the base, the base wall thickness and how thick the flash hole web is governs how strong and how much pressure can take. [IMG]http://i.imgur.com/IBJQA9p.gif[/IMG] Measuring base expansion tells you the elastic limits of the brass. And similar to brass flowing into the ejector and exceeding the elastic limits of the brass. [IMG]http://i.imgur.com/KtO65uH.jpg[/IMG] [U][U][U][U][U][U][U][U][U][U][U][URL="http://www.hodgdonreloading.com/reloading-education/tips-and-tricks/simple-trick-monitoring-pressure-your-rifle-reloads"]Simple Trick for Monitoring Pressure of Your Rifle Reloads | Hodgdon Reloading[/URL][/U][/U][/U][/U][/U][/U][/U][/U][/U][/U] To the OP, try another brand of case and look for cases built Ford Truck Tough. :D [/U] [/QUOTE]
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Case web expansion help
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