What causes this??

Just loading up some 7mmRM loads, fully resizing and this happened all of a sudden on about 4 cases?
Any ideas? Attachment 16640

possibly too much lube

They'll fireform:oh noes:

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Originally Posted by PTK

possibly too much lube

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+1

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Originally Posted by kiwijames

+1

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+2

I've had cases come out the rifle chamber like that after firing. No lube there. Different cause than in this case, no doubt.

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Originally Posted by 303Guy

I've had cases come out the rifle chamber like that after firing. No lube there. Different cause than in this case, no doubt.

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Probably gas coming back from thick neck/large neck clearance/low load not sealing neck against chamber.

From what i gathered from opening post the cases were fine until sized.

Cheers guys, simple fix :)

Cam reloading smokeless, if using the same rifle chamber, do you have to size? Or just check length, BP I never size one fire formed

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Originally Posted by Maca49

Cam reloading smokeless, if using the same rifle chamber, do you have to size? Or just check length, BP I never size one fire formed

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Yep, unless tight neck chamber turned cases and very small tolerance from neck to chamber that doesn't stretch the neck past point of no return.