It was a squib, for goodness sake. No leaking gas or hard jackets.
Back in the day, with military ammo, we encountered squibs and a not insignificant number of missing, cocked, and inverted primers in all small arms calibers. The ammo came from all of the military producers. Without going into the whole story, the main problem was simply what you would expect, QC was weak and runny. I imagine the Russkies are no better.