age of the ammo is a potential factor.
whats the headstamp on the federal ammo.
years ago when 40sw was young caliber Federal made some ammo that was thin in the casehead and would rupture when fired in poorly supported chambers.
Divided and conquered, Gripped by fear
Wishful thinking that it can't happen here
It's well underways but nobody knows
A repeat of history, That's how it goes