I have a similar problem, and I would appreciate recommendations. I inherited my grandfather's Winchester 1894 in .30 WCF that was made in 1894. The inside of the barrel is solid black, the rest of the rifle is in good condition with no rust. I have used several cans of Wipe Out and the patches keep coming out black. I can't seem to get all of the black out. Changing the barrel is not an option, because the barrel is a half round, meaning the first half is octagon and the last half if round. Based on the above recommendations I am going to try JB Paste, but is there any other suggestions.