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Rifles, Reloading, Optics, Equipment
Reloading
280 AI case head seperation
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<blockquote data-quote="bigedp51" data-source="post: 1304066" data-attributes="member: 28965"><p>I bought the RCBS case mastering gauge below after I started collecting .303 British Enfield rifles. It works very well for checking case stretching and thinning in the base web area.</p><p></p><p>Below the factory loaded Winchester .303 case below stretched .009 on its first firing.</p><p></p><p><img src="http://i.imgur.com/jDCS39v.jpg" alt="" class="fr-fic fr-dii fr-draggable " style="" /></p><p></p><p><img src="http://i.imgur.com/YoV80b4.jpg" alt="" class="fr-fic fr-dii fr-draggable " style="" /></p><p></p><p>The secret to preventing case head separations is to not let the case stretch and thin on the first firing and minimum shoulder bump thereafter. </p><p></p><p></p><p>Below this Winchester .303 British case started to separate after its second firing. I have been very lucky, in over 47 years of reloading this is as close as I have ever been to a total case head separation. Meaning the RCBS case mastering gauge is far more accurate than a bent paper clip when checking for case thinning.</p><p></p><p><img src="http://i.imgur.com/DVy4C4T.jpg" alt="" class="fr-fic fr-dii fr-draggable " style="" /></p><p></p><p>Bottom line, jamming the bullets into the rifling is a very simple method for fire forming cases. And this works best with faster burning powders that will blow out the shoulder but not generate enough chamber pressure to cause the case to stretch. (below 43,000 psi)</p><p></p><p>Below, it is the amount of head clearance that allows the case to stretch and thin. And as long as you can hold the case against the bolt face when fired the case will not stretch and thin. So jamming the bullet into the rifling or the false shoulder method will work the best. And on a British .303 Enfield rifle at the maximum military headspace of .074 and a rim thickness of .058 you can have .016 head clearance. </p><p></p><p><img src="http://i.imgur.com/HK76WCp.jpg" alt="" class="fr-fic fr-dii fr-draggable " style="" /></p><p></p><p><img src="http://i.imgur.com/sHgqVJR.gif" alt="" class="fr-fic fr-dii fr-draggable " style="" /></p></blockquote><p></p>
[QUOTE="bigedp51, post: 1304066, member: 28965"] I bought the RCBS case mastering gauge below after I started collecting .303 British Enfield rifles. It works very well for checking case stretching and thinning in the base web area. Below the factory loaded Winchester .303 case below stretched .009 on its first firing. [IMG]http://i.imgur.com/jDCS39v.jpg[/IMG] [IMG]http://i.imgur.com/YoV80b4.jpg[/IMG] The secret to preventing case head separations is to not let the case stretch and thin on the first firing and minimum shoulder bump thereafter. Below this Winchester .303 British case started to separate after its second firing. I have been very lucky, in over 47 years of reloading this is as close as I have ever been to a total case head separation. Meaning the RCBS case mastering gauge is far more accurate than a bent paper clip when checking for case thinning. [IMG]http://i.imgur.com/DVy4C4T.jpg[/IMG] Bottom line, jamming the bullets into the rifling is a very simple method for fire forming cases. And this works best with faster burning powders that will blow out the shoulder but not generate enough chamber pressure to cause the case to stretch. (below 43,000 psi) Below, it is the amount of head clearance that allows the case to stretch and thin. And as long as you can hold the case against the bolt face when fired the case will not stretch and thin. So jamming the bullet into the rifling or the false shoulder method will work the best. And on a British .303 Enfield rifle at the maximum military headspace of .074 and a rim thickness of .058 you can have .016 head clearance. [IMG]http://i.imgur.com/HK76WCp.jpg[/IMG] [IMG]http://i.imgur.com/sHgqVJR.gif[/IMG] [/QUOTE]
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Reloading
280 AI case head seperation
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