Back to the Partition "problem", I wonder if there wasn't a process defect in some of the bullets at one time. I recall reading a thread on a defunct site about a .375" Partition appearing to lose its rear core after being shot into a log or something like that. He wasn't complaining, he was just wondering what may have happened. It seemed the responses were it couldn't happen. There were no pictures but the poster seemed perplexed and not accusatory as to what happened.

Also, I think it was Kevin Robrtson who wrote of a similar experience in one of his books. I can't remember his thoughts on the matter were but the mention did stand out. That is about it for the hearsay, anecdotal folk lore I can add to this thread. If there was the rare manufacturing flaw that showed up in the field even once, it would be little surprise to see that story spread and enlarged in short order.