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Rifles, Reloading, Optics, Equipment
Reloading
Shoulder bump with Forster Bushing,Bump, neck sizing
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<blockquote data-quote="bigedp51" data-source="post: 1403927" data-attributes="member: 28965"><p>I have a Forster .223 bushing bump die and any die can be adjusted up or down to adjust shoulder bump.</p><p></p><p>Simple adjustment, remove the bushing, then place a case in the shell holder and raise the ram. Now screw the die down until you feel it touch the shoulder and then back the die off "slightly" so it does not touch the shoulder. Just remember the older the sized case is the harder the brass becomes and will spring back more after sizing.</p><p></p><p>Also remember when using the Hornady cartridge case headspace gauge you measure a "fired" case and then adjust the die for .001 to .002 shoulder bump. Meaning "your" die is not that far off of minimum shoulder bump.</p><p></p><p>Chambers and dies vary in size and if you adjust the die per the instructions there is always a chance the case shoulder will be pushed back too far.</p><p></p><p>Remember you are sizing a belted case that headspaces on the belt and not the shoulder. And to extend case life it is better to headspace off the case shoulder.</p><p></p><p>Example below is a new unfired rimmed British .303 case in a Wilson case gauge. And the case shoulder is far below the chambers shoulder location and dropped far into the gauge.</p><p></p><p><img src="https://i.imgur.com/RBeuevm.jpg" alt="" class="fr-fic fr-dii fr-draggable " style="" /></p><p></p><p>Below is a fired case in the same Wilson case gauge. And the amount the case is protruding from the gauge shows the true location of the shoulder of the chamber.</p><p></p><p><img src="https://i.imgur.com/8WTFm8S.jpg" alt="" class="fr-fic fr-dii fr-draggable " style="" /></p><p></p><p>Rimmed and belted cases date back to time when manufacturing was not at the modern standards today. On top of this the British developed the belted case and were using cordite powder. The cordite powder looked like long strands of spaghetti cut to just below the cases shoulder, and was placed in the case "before" the case shoulder and neck were formed.</p><p></p><p>Bottom line, the case shoulder location was not critical on rimmed and belted cases. "BUT" today you are better off letting the case headspace on the shoulder and not the belt or rim. And your die is if if adjusted as per the instructions is only .001 more shoulder bump than you may need.</p><p></p><p>And Redding makes Competition shell holders so the die still makes hard contact with the shell holder and not push the shoulder back too far. (subliminal suggestion) <img src="data:image/gif;base64,R0lGODlhAQABAIAAAAAAAP///yH5BAEAAAAALAAAAAABAAEAAAIBRAA7" class="smilie smilie--sprite smilie--sprite2" alt=";)" title="Wink ;)" loading="lazy" data-shortname=";)" /></p></blockquote><p></p>
[QUOTE="bigedp51, post: 1403927, member: 28965"] I have a Forster .223 bushing bump die and any die can be adjusted up or down to adjust shoulder bump. Simple adjustment, remove the bushing, then place a case in the shell holder and raise the ram. Now screw the die down until you feel it touch the shoulder and then back the die off "slightly" so it does not touch the shoulder. Just remember the older the sized case is the harder the brass becomes and will spring back more after sizing. Also remember when using the Hornady cartridge case headspace gauge you measure a "fired" case and then adjust the die for .001 to .002 shoulder bump. Meaning "your" die is not that far off of minimum shoulder bump. Chambers and dies vary in size and if you adjust the die per the instructions there is always a chance the case shoulder will be pushed back too far. Remember you are sizing a belted case that headspaces on the belt and not the shoulder. And to extend case life it is better to headspace off the case shoulder. Example below is a new unfired rimmed British .303 case in a Wilson case gauge. And the case shoulder is far below the chambers shoulder location and dropped far into the gauge. [IMG]https://i.imgur.com/RBeuevm.jpg[/IMG] Below is a fired case in the same Wilson case gauge. And the amount the case is protruding from the gauge shows the true location of the shoulder of the chamber. [IMG]https://i.imgur.com/8WTFm8S.jpg[/IMG] Rimmed and belted cases date back to time when manufacturing was not at the modern standards today. On top of this the British developed the belted case and were using cordite powder. The cordite powder looked like long strands of spaghetti cut to just below the cases shoulder, and was placed in the case "before" the case shoulder and neck were formed. Bottom line, the case shoulder location was not critical on rimmed and belted cases. "BUT" today you are better off letting the case headspace on the shoulder and not the belt or rim. And your die is if if adjusted as per the instructions is only .001 more shoulder bump than you may need. And Redding makes Competition shell holders so the die still makes hard contact with the shell holder and not push the shoulder back too far. (subliminal suggestion) ;) [/QUOTE]
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Shoulder bump with Forster Bushing,Bump, neck sizing
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