How does this happen?

This 9mm looks like a belted magnum. This is one of my reloads.

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Does your resizing die seat against the shell plate properly? It looks as if it doesn’t get to the bottom of the case.

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I’ll save my deleted post for the joke thread :face_with_hand_over_mouth:

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Can’t explain this one

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I have crunched a few cases, but I haven’t encountered that.

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Yeah i would think if it did this in resizing it would have not ran through the other stations.

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I agree, since the rim looks deformed.

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I’ve had similar issue before. Both instances the case was overstretched and i didn’t measure and trim it.

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It was too long and you didn’t trim to length. Sizing die did that.

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Seems reasonable. I never take the time to trim straight wall pistol cases.

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That’s what I would think. The only place this can happen is in the sizer or seater.

Do you run a seating/crimping die by chance? You could have a roll crimp set up wrong

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I run a separate crimp die

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Is that range pickup brass?

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Yup

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Ok. It could have been fired in something like a 40 S&W, fire formed to that chamber. Resizing to 9mm wouldn’t iron out all the deformation. Mic the bulged area. Is it about .425", maybe more?

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I’m going to pull the bullet later and I’ll post pics of the inside.

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I think so too now that you pointed that out. Be interesting to see the thickness of the case wall. Maybe case length too.

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The case is buldged inside the case almost like it was fired out of battery.

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This is the downside to reloading on a progressive. Wish i new what this case looked like before i loaded it.

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