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I'd vote for improperly formed case with resulting brass embrittlement. I too run a 220Swift and have had several WW cases with extended folds running lengthwise on the case. As stated, brass work hardens, so this fold fails(cracks) upon firing instead of expanding to conform to the chamber.
I believe 220 Swift is one of the cases that WW manufactures seasonally instead of continuously. Production setup and fine tuning is probably going to create some garbage that should have been caught but wasn't. S/F....Ken M
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This post is probably based on open source information as reported in the mainstream media. This often tends to be wrong or just plain makebelieve. If my post runs counter to your personally observed experience, let me know so I might learn something new.
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