Mike,
I'm refering to the use of pistol bullets that are normally used in center fired pistols. The Sabots you buy, for a .50 M/L are usually .44 or .45 caliber. When you buy them in bulk or reload for use in reloading pistols, they are lubed. If you use these in a sabot, you should remove that lube. This is an inexpensive alternative to using one of those more expensive jacketed bullet they sell for in-line M.L's. Sorry if I was not all that clear .....
Be Safe !!!