If you've ever watched a commercial bullet swaging machine crank out bullets, it's a wonder more of them don't come out a little "off". That jacket looks like it may have not gotten a full core, but from the pictures it's hard to tell. It may have just fell off the track before the final point form die.
I believe Jake Wilcox, the owner of Rocky Mountain Reloading, may have a link to his in-house bullet swaging machine and core cutter. It's pretty amazing to watch, and when you consider they're making these bullets by the millions, the QC is pretty good.
Hope this helps.