Jim, as you know, I'm particularly interested in knowing where rare/oddball civil war projectiles got used. For example, my book makes mention of the very few locations where 3.67" Sawyer shells were used, and the same info about "20-Pounder" Brooke shells.
Please tell us whatever locations you know of where those US .62-caliber 3-groove Minies have been dug.
Regards,
Pete