Daryl,
The rifles I had trouble with were moderate intensity cartridges, two 30-06's and a 375H&H (also a 7mmRm)at about 500 rounds fired in each. Barrels were sometimes shot a bit warm but never hot.
Used as per directions Wipe Out patches would come out black/blue, then the patches would come out clean. After another application of W Out the patches would come out light blue then clean. Thought the barrels were clean until I had barrels start to go south. Brought the 7mmRM back with much work and JB paste, could feel tightness in the throat with the jag. Started looking into my cleaning routine after that and found even after the barrel was "clean" with W Out I could get a lot of black (carbon) out of the barrel using Elite and a new bronze brush. Even Hoppes #9 on a brush used before W Out would take most of the carbon out. If I used W Out first the carbon seemed much harder to remove, almost like the W Out had removed any "oils" from the carbon. This "hard carbon" is different than the ring in the throat.
I feel the W-Out if not used with a carbon cleaner will leave a lot of carbon behind which accelerates the creation of the ring in the throat. Many seem happy with W Out so it might just be me, or the combination with Varget may have something to do with the problem, or it could be the phase of the moon, but I do think W Out used alone caused problems in my barrels. These were all factory barrels, a lapped barrel may give different results.