www.handgunlaw.us
It's imposible to answer your question without knowing where you live, and what states you have carry permits for/from. Since you may not want to divulge that information, use Handgun Law to review.
My fuzzy recollection is that South Carolina isn't great on reciprocity. That said, it appears that they will honor a Kentucky permit -- if you live in Kentucky, and if you have a Kentucky carry permit.