The only rust pitting I've ever come across personally was in a mates Tikka T3 in 6.5x55 with stainless barrel. The internals were totally pitted the entire length. I took it to the range and I managed to shoot a 10 shot 3" group with it at 100m... still, that pales to the ten shot 6" group that 'he' managed to eek out of it!
I own a bore scope and ALLWAYS simply thoroughly clean my S/S barrels and store them "completely dry", sometimes for a couple of years or more on end, and I ain't NEVER seen anything untoward like rust pits down any of my barrels! Removing that carbon is the biggest killer for barrels as it's a desiccant in it's own rite! A barrel nearly always looks clean when you hold it to the light, but, put a bore scope through it and quite often it's a different story!
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