I is 20deg here and I have a dry, woodstove heated house. Unsurprisingly, cold brown didn't work well. I didn't want to build a a humidity box or shower with the barrel. Remembering how guns sweat when coming in from hunting when it's cold, I put the barrel out on the cold deck for a while then bought it back in-repeated several tomes through several treatments. It seems to be working well.
Turtle