I too have heard the conflicting reports. Moly is a high pressure, high temp, lubricant. I can't say if it helps velocities or reduces fouling although I wouldd have some doubts about both. On bullets it does help with velocities and it can create cleaning problems, expecially if the bore is not clean before the moly is used. I would use an electronic cleaner to be truly sure the jacket fouling is gone. I just find it too much trouble for so little gain. Once applied to the bore either by actually applying it or by firing coated bullets it is very difficult to remove.