Very good question.Did you inspect the primer? Was the firing pin strike significantly off center? One would think if it was out of time enough to make the bullet miss the forcing cone, the firing pin would miss the primer. But then again, I don't know how much off center it would have to be to blow up the gun.
I did read where one guy said his taurus was not locking up which could clearly make the time off (he sent it in for repair, did not have a KB), but I still wonder about the primer strike.