In SC, you can carry a loaded gun in the glove compartment. No need to lock or unload it. Do NOT put it under the seat. If you have a NC resident CCW then you can also carry on your person.
Bill H. 3161
If the person has been issued a concealed weapons permit pursuant to Article 4, Chapter 31, Title 23, then the person also may secure his weapon under a seat in a vehicle, or in any open or closed storage compartment within the vehicle's passenger compartment;
Hope this helps.