Did some research and the Hornady website (Hornady makes the round) considers the T/C .30 a separate round.
My gut's telling me this guy bought them in error and is trying to unload them.
CETME .308 Sporter
Hi-Standard Duramatic M-101
H&R 1874 12 Guage
Mosin Nagant M91/30
“It's too easy sometimes to give in to despair, unless, of course, you’re talking about politics, in which case you don't really have any other option.” Mike Littwin