Semisane
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."
Dang! Well that about covers it... and basically what I have been doing with the lightly lubricated barrel that I am always talking about during hunting season in the woods.