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Yeesh, I would seriously consider sending a batch of that brass including the failed case away to go back to the manufacturer for analysis - unless we are talking the shortage of the early 1940's or...

Total case failure? Was the barrel blocked at the end of the episode or evidence of obstructed barrel or just a case failure you think? Nasty either way.

Might be the best pest control round ever invented - there are other ways to kill pests that don't carry such a high level of risk IMO. Having seen the aftereffects of one of these .17 rimfire...