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<blockquote data-quote="1911user" data-source="post: 1279910" data-attributes="member: 57493">I&#039;d check if the plated bullets were undersize.&nbsp; If that is OK, I&#039;d check if the sizing die is resizing the brass enough.&nbsp; With a rimless case, the bullet is held in place by tension between the case and bullet, not how much you crimp it.&nbsp; This isn&#039;t a roll crimp like you&#039;d apply to traditional revolver (rimmed brass) rounds.&nbsp; An ideal rimless case crimp is simply removing the belling&nbsp; from the expander stage.&nbsp; On a plated bullet, the lead is relatively soft.&nbsp; So each time you try to crimp it &quot;harder&quot; the case and bullet are squeezed down in size a bit.&nbsp; The brass case springs back, but the soft lead does not.&nbsp; Really tight crimps are probably making your problem worse.&nbsp; This is also the reason I have no use for plated bullets when bulk FMJ cost only slightly more.&nbsp; If there was a big price difference, it might be worth the reloading effort and time to come up with a plated bullet load that works for you.</blockquote>

[QUOTE="1911user, post: 1279910, member: 57493"] I'd check if the plated bullets were undersize. If that is OK, I'd check if the sizing die is resizing the brass enough. With a rimless case, the bullet is held in place by tension between the case and bullet, [U]not[/U] how much you crimp it. This isn't a roll crimp like you'd apply to traditional revolver (rimmed brass) rounds. An ideal rimless case crimp is simply removing the belling from the expander stage. On a plated bullet, the lead is relatively soft. So each time you try to crimp it "harder" the case and bullet are squeezed down in size a bit. The brass case springs back, but the soft lead does not. Really tight crimps are probably making your problem worse. This is also the reason I have no use for plated bullets when bulk FMJ cost only slightly more. If there was a big price difference, it might be worth the reloading effort and time to come up with a plated bullet load that works for you. [/QUOTE]

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