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Rifles, Reloading, Optics, Equipment
Reloading
What's causing dents in brass
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<blockquote data-quote="bigedp51" data-source="post: 1296219" data-attributes="member: 28965"><p>Good call Barrelnut. below is a hang fire from surplus Pakistani .303 British ammo during rapid fire mad minute. The bolt was partially opened when the round fired, and this blew the magazine into the ground. And as you can see this caused the front half of the case to collapse when all the pressure vented at the rear of the case. The shooter was not injured other than having to change underwear. The joke with this old ammo was it was "click............................................bang" ammo.</p><p></p><p><img src="http://i.imgur.com/53ye2jY.jpg" alt="" class="fr-fic fr-dii fr-draggable " style="" /></p><p></p><p>The OP needs to let his cases headspace on the shoulder and not the belt.</p><p></p><p>Below is a commercial .303 British case stretching and thinning due to long military headspace.</p><p></p><p><img src="http://i.imgur.com/sHgqVJR.gif" alt="" class="fr-fic fr-dii fr-draggable " style="" /></p><p></p><p>If the cartridge is properly fire formed the first firing it will not stretch and thin. Thereafter you let the case headspace on the shoulder and hold the case next to the bolt face.</p><p></p><p><img src="http://i.imgur.com/AQEQ9Vw.jpg" alt="" class="fr-fic fr-dii fr-draggable " style="" /></p><p></p><p>The same applies to any type case no matter the type headspace mechanism.</p><p></p><p>It is the amount of head clearance that causes the case to stretch and thin. And when kept between .001 to .002 of shoulder bump it is well within the elastic limits of the brass. Meaning the case can expand and spring back and not stretch and thin.</p><p></p><p><img src="http://i.imgur.com/HK76WCp.jpg" alt="" class="fr-fic fr-dii fr-draggable " style="" /></p></blockquote><p></p>
[QUOTE="bigedp51, post: 1296219, member: 28965"] Good call Barrelnut. below is a hang fire from surplus Pakistani .303 British ammo during rapid fire mad minute. The bolt was partially opened when the round fired, and this blew the magazine into the ground. And as you can see this caused the front half of the case to collapse when all the pressure vented at the rear of the case. The shooter was not injured other than having to change underwear. The joke with this old ammo was it was "click............................................bang" ammo. [img]http://i.imgur.com/53ye2jY.jpg[/img] The OP needs to let his cases headspace on the shoulder and not the belt. Below is a commercial .303 British case stretching and thinning due to long military headspace. [IMG]http://i.imgur.com/sHgqVJR.gif[/IMG] If the cartridge is properly fire formed the first firing it will not stretch and thin. Thereafter you let the case headspace on the shoulder and hold the case next to the bolt face. [IMG]http://i.imgur.com/AQEQ9Vw.jpg[/IMG] The same applies to any type case no matter the type headspace mechanism. It is the amount of head clearance that causes the case to stretch and thin. And when kept between .001 to .002 of shoulder bump it is well within the elastic limits of the brass. Meaning the case can expand and spring back and not stretch and thin. [IMG]http://i.imgur.com/HK76WCp.jpg[/IMG] [/QUOTE]
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What's causing dents in brass
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