None that I know of. Mind you I've won all my DCRA medals with moly-coated 69 gr SMK's out of my Olympic Arms 20".
Once in a while I would flush out my gas tube with Gunk Out or Brake Cleaner (outdoors of course).
Eventually, I gave up on moly coating since I was just annoyed or tired of washing my hands everytime I handled the bullets. Reloading moly'ed bullets ended up soiling my powder measure handle and the press handle. Yeah, I was also too lazy to "wax" the moly'ed bullets and I deserve the soiling I got.
Once a friend was doing some reloading of their own. After throwing 100 cases with powder, he seated the bullets and then scratched/rubbed his upper lip giving himself a "Hitler" moustache. I did not tell him to look into the mirror before he drove back home. He gave his wife a cute surprise. ha ha ha
Cheers,
Barney