I have never had any problems with factory ammo until today. WW, white box, a couple of years old. Kept in mags as a backup. Went to range, out of 24 rounds I had 2 squib rounds where bullet did not exit barrel, 5 hang fires (like shooting black powder). I do not remember having these problems from the same ammo before. Again, this was a couple of years old I had in a firearm I trusted as a backup. Rotate Ammo!