Moly coated bullets have lost alot of ground in popularity. Coating the bore seems to be the way to go, but I have never used any moly anything.
I use moly grease in the actions of almost all my guns. We use it quite a bit at work, too. Great stuff, moly. Coating your barrel with it will cut friction (not good for a lot of velocity, but good for some) which will helps reduce barrel wear and really reduces fouling.
Well, there's nothing out there that shoots better than they do, so there's some degree of proof behind the talk. I think the 1000 yard record is just over 1/4 MOA, which was a 4.4" group.
Yes, they do, but they can really go overboard with things like over-cleaning and "barrel break-in" that serve no positive purpose.