What about a lube for a sabot load?....or even a conical like a FPB or PB?
Also anyone try graphite or the like instead of a wet lube?
Use Mr. Flintlock for sabot bullets or sabotless Powerbelt bullets too. But instead of a wet application, use lightly on a normal 2-1/2 or 3" cleaning patch, followed by both sides of a dry patch.
Your range groupings afterwards will determine if it works well for you. It never hurts to try something new.
