I thought it was pretty well proven that moly had no value. According to Richard Vaughan in "Rifle Accuracy facts," it has no effect on accuracy or barrel life. All it does is use some of the powder energy (and pressure) to vaporize the moly in the barrel, which then condenses again. The result is lower pressure and of course lower velocity. So the handloader must add more powder to get the original pressure and velocity. Some end up adding enough more and get higher velocity but don't now they are operating at higher pressure than to begin with to do that.
