Shame on you! That pic's been floating for some time now. Just some idiot who bought a reloading kit!!! Darwin will get him soon enough!
I've personally seen the aftermath of one that kaboomed in the hands of another member on here and read about at least one other instance.
Fact is, production manufacturing is all about spitting out a bunch of stuff as fast as you can whilst making money off the process - crap happens to steel just like it does with alloy (and design/manufacturing/qc flaws are present in them all).