I have done it and did a bunch of comparison loads.Many of the moly coated bullets actually shoy better groups than their non-coated counterparts. I had some moly powder that you put in a container with 100 bullets and put them in my Lyman 1200. It was best to heat the bullets after coating to help the moly form a good coating. The bullets were a pita to handel because they were so slippery.
Now that said I did run into some competition shooter and others in the industry and asked what they thought about moly and I heard several say that it puts a hard,almost glass like coating in the bore that is impossible to remove.Now, I don't know how many shots it took, or if that was just rifle or pistol.It may just be certain types of moly or specifis calibers.
I shot about 200 rounds out of 1 40S&W barrel and it was getting pretty shiny and smooth looking (kind of like glass). It shot fine and I still shoot it today(not with moly) and I don't see that shine anymore so it may just wear off,I really don't know.
It was just an experiment and I haven't shot them anymore.I do have a couple hundres bullets and more of that powder left so someday I might pound them through that barrel again and see what happens.
