Chapter 3 · Course Information · p.20
3.3Applicability of the Rules
USPSA matches are governed by the rules applicable to the discipline. Host organizations may not enforce local rules except to comply with legislation or legal precedent in the applicable jurisdiction. Any voluntarily adopted rules that are not in compliance with these rules must not be applied to USPSA matches without the express written consent of the USPSA Director at Large. All local rules allowed under these provisions will be documented at USPSA HQ.
In states where competitors are restricted by law to maximum magazine capacity, that maximum capacity will be the maximum allowed for all competitors in the contest. Any such limitations must be made known to all competitors by the Match Director/Range Master before the start of the match.