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I would not worry unduly about it, just inspect the other cases for signs of similar. It will be worth investing in some new brass at some point as it does have a finite life.

I was looking at the .308 brass I was shooting yesterday, the last two times out have been in heavy rain and add a hot load and it is certainly time to look for some more now however given that it has been shot well into double figures I guess I should not be too unhappy with it.

I've got some new brass, and the rest of this batch of brass looks fine, think it was just a duff case.

Just interesting to see how its broken and what the cause is.