Brownells VFG pellets for carbon

[Gene]

I am having issues with heavy carbon in several barrels. A friend scoped my Dasher and carbon was extensive inside a Bartlien barrel. I was told the Brownells intensive cleaning pellets with wire in them will positively clean the bore.

WEAPONS CARE SYSTEM PELLETS | Brownells

What is your experience with them? Better than JB? Will they harm the bore? Thanks