Had a first, today. I tried to remove the barrel from a 1960s Savage, so that I can put a barrel on that I worked on a few years ago. I heated the barrel nut and receiver, then proceeded to pound, then pull on the wrench to break the nut loose. The teeth on the wrench gave way, but the nut didn't. Every tooth on the barrel nut wrench was torn out. May or may not give it a try tomorrow with the other side of the wrench. One of the other guys said he had one that way recently, and ended up using an action wrench and taking the receiver off, but leaving the nut on the barrel.