Over the past 3 years I've put almost 1400 rounds of it through my Remington 22-250 and I haven't noticed a degredation in accuracy yet. I don't have a bore scope, but the groups are not opening up yet.
Moly has been losing its popularity as the years progress.At one time it was claimed that it would cut friction thus giving you higher velocities.If you actualy put moly in your gun powder you get the same velocity as you do when you coat your bullets with it.This points more too it being a propellant retarding agent.If you burn slower powders you get less heat and a longer push on the bullet and thus you are able to load them to higher velocities.
The ammo that I was referring to was the Winchester Balistic Silvertip with their lubalox coating. On a prarrie dog shoot I did notice that after about 200 rounds my accuracy began to drop. A quick pass with a bore snake and I was hitting consistantly again. I suggest cleaning before that point so your hit ratio doesn't start to make you second guess your shooting ability