Been using coated lead bullets. It is cleaner than bare lead, and costs only slightly more. Logic would dictate a coated jacketed bullet would do the same, but regular jacketed bullets are pretty clean anyway in regards to jacket fouling if the barrel is good. IMHO, I don't see the benefit vs the added cost over plain jacketed range ammo. However, when reloading the coated lead, the benefit of less cleaning time is worth the (very small) added cost.