Yes, WWWB is usually pretty reliable ammo. That sounds like a case failure to me. Sometimes older brass will do that, kind of an age hardening condition? I have never had a failure of any kind with WWWB or REM-UMC, even though they're bargain ammo. I keep a good bit of this bargain ammo on hand in case i don't have enough hand loads to meet my plinking needs.

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dd884
JMHO-YMMV