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Rifles, Reloading, Optics, Equipment
Reloading
RCBS FL Dies
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<blockquote data-quote="bigedp51" data-source="post: 1135411" data-attributes="member: 28965"><p>We live in a plus and minus manufacturing world and no two resizing dies and chambers will be the same. I have a Lee .223 full length die that sizes the cases smaller in diameter than my small base dies do.</p><p></p><p>Another problem with once fired brass fired in another chamber is brass spring back. For my AR15 rifles and once fired Lake City brass I use a RCBS small base die the first time the cases are sized. Thereafter I use a standard RCBS die on these Lake City cases.</p><p></p><p>NOTE, a small base die returns the case to SAAMI minimum dimensions, but my RCBS small base die only makes the case .0005 smaller in diameter than the standard RCBS die. </p><p></p><p>If you have once fired brass fired in a machine gun these chambers can be .004 larger in diameter. Meaning more effort when sizing the case and "MORE" brass spring back to its fired diameter after sizing. If you pause at the top of the ram stroke for a few seconds the brass will spring back much less.</p><p></p><p>Your die and your friends die shows you how dies can vary in size and it also shows you the problems you can run into using once fired brass.</p><p></p><p>Below some of my .223/5.56 dies and each one varies in how much it sizes the case.</p><p></p><p><img src="http://i122.photobucket.com/albums/o254/bigedp51/dies003_zpsf9af9a52.jpg" alt="" class="fr-fic fr-dii fr-draggable " style="" /></p></blockquote><p></p>
[QUOTE="bigedp51, post: 1135411, member: 28965"] We live in a plus and minus manufacturing world and no two resizing dies and chambers will be the same. I have a Lee .223 full length die that sizes the cases smaller in diameter than my small base dies do. Another problem with once fired brass fired in another chamber is brass spring back. For my AR15 rifles and once fired Lake City brass I use a RCBS small base die the first time the cases are sized. Thereafter I use a standard RCBS die on these Lake City cases. NOTE, a small base die returns the case to SAAMI minimum dimensions, but my RCBS small base die only makes the case .0005 smaller in diameter than the standard RCBS die. If you have once fired brass fired in a machine gun these chambers can be .004 larger in diameter. Meaning more effort when sizing the case and "MORE" brass spring back to its fired diameter after sizing. If you pause at the top of the ram stroke for a few seconds the brass will spring back much less. Your die and your friends die shows you how dies can vary in size and it also shows you the problems you can run into using once fired brass. Below some of my .223/5.56 dies and each one varies in how much it sizes the case. [IMG]http://i122.photobucket.com/albums/o254/bigedp51/dies003_zpsf9af9a52.jpg[/IMG] [/QUOTE]
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RCBS FL Dies
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