Riflemans Journal has 4 articles dedicated to Moly coating. It is a good read.
My personal experience has been that it is something that is not worth the pursuit. Shooters can be a superstitous bunch when it comes to what matters, and how much it matters on some things.
Plain old copper jackets hold plenty of reccords in Palma and NRA prone competitions. Any advantage because of moly is more likely going to show up because of the shooters increased confidence, not because of the moly itself.