Never, if something ever happen your at fault.
With a company you could file suit for faulty ammo. Say they made faulty ammo on day 1 and you had a SD on day 5 when you put the ammo in your gun. They release a statement on day 8 faulty ammo you had bought in x time frame.
SHTF vs TEOTWAWKI you ask? SHTF, just some crap on the ceiling and walls, TEOTWAWKI end of the world as we know it. Orignally made by 9mm/®™©