Maybe I've been doing it all wrong, but I've never used a barrel vice in conjunction with an action vice and nut wrench. I put the action in the NSS action wrench mounted in a bench vice, crack the nut loose and spin the barrel off. Be careful removing the nut from the barrel though, it'll probably have a lot a blast media under the threads, and you'll want to go carefully and slowly using plenty of liquid wrench if you want to save either. Once you have the nut cracked loose, you might have to loosen the bolts in the action wrench a tad. When they are good and tight, they'll pinch the barrel making it difficult to remove from the action. I can imagine that this is sometimes mistaken as an indication that thread sealant was used at the factory while installing the barrel.
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