One thing that is different is the 308 is a rebated rim and 30-30 is a rimmed cartridge this will require a different shell holder. The dims on the 308 are Length 2.015 angle degree 20 neck dia. .343 case dia. .454 case length to shoulder 1.56 case to bottom of shoulder 1.711
The 30-30 Length 2.039 angle degree 15 39' neck .332 case dia @ head .421 case dia @neck angle .401 case length to shoulder 1.35 case to bottom of shoulder 1.55 So I would conclude that it would not be the wisest thing but could possibly be done if no other means was available. These dims are from the 47TH edition Lyman manual.