@hunter-thurmond have you used the Digital Atlas of Ancient Life? It is an online ID guide, and has a Neogene guide for the Southeast US.
http://www.digitalatlasofancientlife.org/
There are a lot of gastropods to sort through, but this one caught my eye as similar to your specimen:
http://neogeneatlas.net/species/turbonilla-abrupta/
I would look through the others too, since I just did a brief glance through some of the snail families!