The pamphlet that comes with Hornady SST'sstates;

"The use of lubricants on the exterior of the sabot is not necessary. However, the sparing use of a lubircant will ease loading in many rifles and will also ease in cleaning the bore. If you choose to use a lubricant, use sparingly. Careless use of lubricants can contaminate the powder charge and cause hang-fires or misfires."