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Message: <blockquote data-quote="bigngreen" data-source="post: 1216555" data-attributes="member: 13632"><p>A full length sizer won't get it back down because when it was fired in the original chamber that spring back is larger than your chamber so when you full length size the spring back is to much for your chamber so you have to use a small base die to size it far enough that the spring back after sizing is inside the size of your chamber. Or polish out your new chamber to fit the once fired brass.</p></blockquote><p></p>