Good thoughs about the tin cup and the ballistically nightmare.
As I said I have heard of a relics dealer around Manassas Battlefield who supposedly had one of these bullet. IF it were "genuine" then that would suggest that maybe more than one was "manufacturing" these things. I am not discounting the possibility that the relics dealer is dealing a "repro" based on this same article.
Newspaper articles are notorious in their inaccuracy. So I originally was wondering if there were some other reference source mentioning this bullet.