You are definitely done. The barrels look nice. If Brownell's said 6 to 20 iterations, it must be a weak rusting agent. If you plan to do more barrels, I would recommend Laurel Mountain Forge. It is a strong agent that some dilute, but I've never had a need to do that. With 5 iterations, you are done most of the time. And Laurel Mountain is a lot more forgiving if you touch the barrels or other contaminants get on them.
Nice job Brian!
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