223 and 9mm in a Dillon 550- Same shell plate?
I noticed that the 9mm and the 223 have case heads that are very similar in size. Would the same shell plate in a Dillon 550 work for both? In a single stage press, the 40 and the 9mm use the same shell holder but it is sized in between the two. The head on the 223 is slightly smaller than the 9mm and will not work with the 9mm/40 shell holder.
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Call Dillon and ask them, they are very helpful. I sold my 550 last year but I think I had a 223 shell plate that came by mistake and it would not accept a 9mm. Please note that my memory is not a reliable source!!
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