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Rifles, Reloading, Optics, Equipment
Reloading
Headspace and case stretch
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<blockquote data-quote="bigedp51" data-source="post: 1635105" data-attributes="member: 28965"><p>You use the Hornady cartridge case headspace gauge to measure fired cases. Then you adjust the die for minimum shoulder bump for long case life.</p><p></p><p>Rimmed and belted cases are older designs when manufacturing tolerances were sloppy by today's standards. And the shoulder shape and location was not important. Below are .450 Henry-Martini cartridges, the case on the left is a modern cartridge and the case on the right is from the 1879 Zulu war.</p><p></p><p><img src="https://i.imgur.com/sDrsB0Q.jpg" alt="" class="fr-fic fr-dii fr-draggable " style="" /></p><p></p><p>Below it is the rim or belt that stops forward movement of the cases until the case has been fired and the shoulder is blown forward. And at the bottom is a modern bottle neck case headspaces on its shoulder. "BUT" with all three type cases it is your head clearance on the fired cases that effects case life.</p><p></p><p><img src="https://i.imgur.com/3cOMj9s.jpg" alt="" class="fr-fic fr-dii fr-draggable " style="" /></p><p></p><p>Below a .303 British commercial cartridge being fired in the larger military chamber. And showing the shoulder being blown forward and the case stretching in the rear.</p><p></p><p><a href="https://imgur.com/sHgqVJR" target="_blank"><img src="http://i.imgur.com/sHgqVJR.gif" alt="" class="fr-fic fr-dii fr-draggable " style="" /></a></p><p></p><p>Below is a neck sized .303 British case with its shoulder holding the case against the bolt face. And why you want minimum shoulder bump on full length resized cases and well within the case brass elastic limits.</p><p></p><p><img src="https://i.imgur.com/AQEQ9Vw.jpg" alt="" class="fr-fic fr-dii fr-draggable " style="" /></p><p></p><p>And again, no matter what type case and how it headspaces in the chamber it is the amount of head clearance that will allow the case to stretch and fail. And as a example I have had new .243 cases that were .009 shorter than my GO gauge. And I simply seated the bullets long and jammed into the rifling to hold the case against the bolt face.</p><p></p><p><img src="https://i.imgur.com/HK76WCp.jpg" alt="" class="fr-fic fr-dii fr-draggable " style="" /></p></blockquote><p></p>
[QUOTE="bigedp51, post: 1635105, member: 28965"] You use the Hornady cartridge case headspace gauge to measure fired cases. Then you adjust the die for minimum shoulder bump for long case life. Rimmed and belted cases are older designs when manufacturing tolerances were sloppy by today's standards. And the shoulder shape and location was not important. Below are .450 Henry-Martini cartridges, the case on the left is a modern cartridge and the case on the right is from the 1879 Zulu war. [IMG]https://i.imgur.com/sDrsB0Q.jpg[/IMG] Below it is the rim or belt that stops forward movement of the cases until the case has been fired and the shoulder is blown forward. And at the bottom is a modern bottle neck case headspaces on its shoulder. "BUT" with all three type cases it is your head clearance on the fired cases that effects case life. [img]https://i.imgur.com/3cOMj9s.jpg[/img] Below a .303 British commercial cartridge being fired in the larger military chamber. And showing the shoulder being blown forward and the case stretching in the rear. [url=https://imgur.com/sHgqVJR][img]http://i.imgur.com/sHgqVJR.gif[/img][/url] Below is a neck sized .303 British case with its shoulder holding the case against the bolt face. And why you want minimum shoulder bump on full length resized cases and well within the case brass elastic limits. [img]https://i.imgur.com/AQEQ9Vw.jpg[/img] And again, no matter what type case and how it headspaces in the chamber it is the amount of head clearance that will allow the case to stretch and fail. And as a example I have had new .243 cases that were .009 shorter than my GO gauge. And I simply seated the bullets long and jammed into the rifling to hold the case against the bolt face. [img]https://i.imgur.com/HK76WCp.jpg[/img] [/QUOTE]
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