S.C. Code Ann. § 18-7-180

If the appeal is founded on an error in fact in the proceedings, not affecting the merits of the action and not within the knowledge of the magistrate, the court may determine the alleged error in fact on affidavits and may, in its discretion, inquire into and determine the alleged error upon examination of the witnesses. Every issue of fact so joined or brought upon an appeal shall be tried in the manner provided in Section 18-7-130.