DBC will not prevent the bore from rusting. I tried and it failed miserably.
I've CKd blued rigs and still wished the bbls were SS afterwards. Humidity is a huge issue here and all my CM guns rust if not constantly oiled. I thought DBC and DGS would be the answer, but sadly it wasn't. It did help, but not any more than routine cleaning.
I don't purchase CM rigs any longer. Heck, even SS rusts here, but it's usually very minor and wipes away with ease.
I live in the south also. I haven't tried DBC so can't comment on that, but the rest of Reloader's post I completely agree with. Any rifle I'm going to hunt with is stainless, period. It might or might not get cerakoted but the guts of it and the barrel are going to be stainless. I put up with 25 years of having to constantly clean and oil chrome moly guns to keep rust away until stainless became commonplace, I can't see any reason to do it any more. It's something that folks living in drier climates can't really comprehend, but stainless steel guns have made my life a lot easier.
