The specific rule regarding PCC states that you can be DQ'd at ANY time for sweeping. I expect if one were to ask Troy this thinking would be extended to include all guns.
10.5.19 Failing to point the muzzle of a PCC at a side berm or back stop during casing/uncasing or removing/replacing on a conveyance or sweeping any person with the muzzle of a PCC, whether loaded or not, even if a chamber flag is inserted. Side berms/backstops may be used for casing and uncasing or removing from/placing on conveyances only. All other gun handling with the PCC, e.g., sight pictures, turning dots on/off, etc., must be accomplished in a safety area or under the direct supervision of a Range Officer