Acetone will not hurt barrels at all unless you swab out the barrel and don't reil it , acetone willremove all oil from the bore and alot of guys say that you can have your barrel to "dry" and it'll foul realy bad.
I use Moly in a couple of my guns that have cheaper barrels and they get shot in higher volume like my factory varmint guns. I have found that in some calibers Iwas able to get a little better accruacy with moly coated bullets I think its do to having to use more powder to get the same velocity as un-coated bullets which give you better load density. Otherwise , I don't bother with it anymore.
When I remove moly from one of my guns , I swab it out several time with acetone then use strait JB bore paste for a dozen or so strokes they clean like normal , thats always worked good for me