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Sounds like the powder inside the cartridge got wet, and started to decompose. The decomposition products are acidic, and attack the the brass, leading to the corrosion split. The decomposition reaction is also autocatalytic, so once it starts it really takes off, bubbles and all.
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I used to love being able to hit hard at 1000 yards. As I get older I find hitting a mini ram at 200 yards with the 22 oddly more satisfying.
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