I can only attribute this to the coating not holding up against the powder solvents that are used to clean the inside of the barrel. Unfortunately, after a quick Google search, I found that many folks have had this same issue; some have sent it back to Browning but have been told that this is due to "normal wear and tear". I'm pretty disappointed with this and am currently looking into an alternative company to have this barrel dipped in the same camo pattern, in a coating that is more durable.
I'll let you know after the upcoming season who I decide to go with and just how good it holds up. I'd like to hear from others if they have experienced similar issues with Dura Touch coatings, so leave a comment below!