30/30 is not straight walled. You could however use it in those counties that are currently ok for rifles. Places like most of Frederick and the western counties, Carrol, Caroline, and a few others.
Got it confused w .30 carbine. Can't see why that wouldn't work w a 308 can? Not sure I'd want to shoot a deer with it. Guess I need their new 45/70 capable can then and wait a year.