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Rifles, Reloading, Optics, Equipment
Rifles, Bullets, Barrels & Ballistics
Pros/Cons of 30 vs 40 degree shoulder?
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<blockquote data-quote="sable tireur" data-source="post: 2582878" data-attributes="member: 27307"><p>Let's face it, 20° and 17° shoulders were created for those cartridges selected for use by the military. This is to guarantee absolute feeding and functioning, no failures from magazine to chamber. The belt on 'magnum' cartridges guaranteed safe, repeatable headspace when the H&H cartridge case use shoulders with very mild 15° shoulders in order to accept the strands of Cordite easily.</p><p></p><p>Unfortunately, this thinking has continued throughout earlier case designs without any additional thinking about what might be an improvement. Ackley gave us the largest angular change with the 40° shoulders (AI). But the 7x61 S&H uses a 42.25° shoulder straight from the factory.</p><p></p><p>Now even the grandly supported .243 and .260 have been designed properly with the advent of the Creedmoor cases. What once was readily acceptable (mild shoulders) is now making headway with the 30° shoulder. And the Dasher cases come from the factory with 40° shoulders.</p><p></p><p><img src="data:image/gif;base64,R0lGODlhAQABAIAAAAAAAP///yH5BAEAAAAALAAAAAABAAEAAAIBRAA7" class="smilie smilie--sprite smilie--sprite1" alt=":)" title="Smile :)" loading="lazy" data-shortname=":)" /></p></blockquote><p></p>
[QUOTE="sable tireur, post: 2582878, member: 27307"] Let's face it, 20° and 17° shoulders were created for those cartridges selected for use by the military. This is to guarantee absolute feeding and functioning, no failures from magazine to chamber. The belt on 'magnum' cartridges guaranteed safe, repeatable headspace when the H&H cartridge case use shoulders with very mild 15° shoulders in order to accept the strands of Cordite easily. Unfortunately, this thinking has continued throughout earlier case designs without any additional thinking about what might be an improvement. Ackley gave us the largest angular change with the 40° shoulders (AI). But the 7x61 S&H uses a 42.25° shoulder straight from the factory. Now even the grandly supported .243 and .260 have been designed properly with the advent of the Creedmoor cases. What once was readily acceptable (mild shoulders) is now making headway with the 30° shoulder. And the Dasher cases come from the factory with 40° shoulders. :) [/QUOTE]
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Rifles, Reloading, Optics, Equipment
Rifles, Bullets, Barrels & Ballistics
Pros/Cons of 30 vs 40 degree shoulder?
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