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Split cases?

Bbowl1

Private
Full Member
Minuteman
Oct 14, 2012
76
0
Portland, Oregon
While this isn't exactly a reloading question as it's factory anmo I just think this is the best place for the question.

Beretta cheetah .380

Blazer brass factory ammo - at least a few years old

We have never had an issue with this pistol before. Today 2/14 cases ended up split. These cases are discolored. Not all in the box just some, both the splits are.

Brass became brittle?
High pressure for some reason?