Sounds like it was probably the powder that caused the "hang". I really doubt the primer is going to 'spark' after it has been struck if it doesn't go on impact. (I have seen quite a few powder hangfires, generally when a powder is either not well matched to the application, or the powder volume is less than ideal.) I have had sluggish firing pin failures, but never hangfires from that cause.
Was that a standard or magnum primer? I've used that same load quite a bit with CCI 200s, and it will work, but I trust it more with a magnum primer on board.
