Nobody in this discussion has asked, but I'll post the info anyway, in case anybody is interested. As my book on civil war artillery projectiles shows, I am very interested in gathering data on where (the specific sites) various types of rare projectiles got used. So, if anybody cares to know... I dug an Enfield minie with the 55 base-mark at the Murfreesboro/StonesRiver battlefield, back in the mid-1970s.
Regards,
Pete George