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...found this when cleaning some cases that I got with my rifle. Never seen this before, any ideas how it happend?

I'm guessing there was a manufacturing problem and the force of expansion when firing caused the split...

Case head separation, either head space issues or more likely brass shot many times.

What do you mean by head space issues? I don't believe this case has been shot that many times.

Toby,

This can happen if the case has been 'bumped' to much - creating the same effect as excessive headspace.

Cheers
Vince

Have you tried the Paperclip Test on the rest of the cases?


Some good advice Here..

TobyH wrote:...found this when cleaning some cases that I got with my rifle. Never seen this before, any ideas how it happend?

I'm guessing there was a manufacturing problem and the force of expansion when firing caused the split...

DamagedCase.jpg

Doesn't it look a bit too regular for head separation due to case life or headspace issues?

..

I agree, from what I've seen of the head space issues. The line looks to me like its just at the top of where the heavier bottom section starts to meet the thinner side walls. The other thing to note is that there is no break in the case.

I've just put it into a case holder and pushed the top with a fair amount of force. The case has now split into two parts very cleanly along the line, almost like a fracture. Will take a pic tomorrow.

...found this when cleaning some cases that I got with my rifle

Does that mean that you have not fired this case?
Has it been fired or is it still shinny on the inside?

I recently bought a load of cases and found one with a deformed neck. I guess deformities are common if you buy enough and the Quality Control is not 100%

DM

It has been fired, but not by me. Previous owner used 125gr Scenars, whereas I'm using 139gr.

Some more pics since splitting: