I've moly coated everything from normal jacketed lead hunting bullets, Barnes X bullets, to many of my cast bullets. Here is what I have noticed. On cast bullets, I applied the Ms Moly aerosol over dried Lee Alox lube. I have had NO LEAD FOULING problems doing this, and have noticed no moly buildup in my handguns or rifles... On the Barnes X, the Ms Moly DID reduce the copper fouling, but in some cases it changed accuracy enough that I needed to rework the loads from the ground up... I'm sort of neither here, nor there as to how I feel about Moly coating, but I do know that it was once the big thing, and now, due to reported buildup problems, has fallen from grace.... :|