Yes you can see hard carbon buildup in a good bore scope.
How do I know it time to use JB? Answer is feel of the patch when I push it through the bore. When the patch is "grabby" its time to use JB, after cleaning the patch will glide through. I understand about being scared to use an abrasive cleaner on your expensive barrel, but I have yet to see where it hurt anything. I have seen many PPC barrels go 4000+ rounds with regular use. Need a bit more convincing? Here is a target I shot in a match last year. This is 5 shots at 100 yards, under 7 minute time limit. This barrel has around 700 rounds on it and has been cleaned with JB close to a dozen times. I think if it was hurting the barrel it would not preform like that.
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