What kind of barrel vice blocks or bushings are you using? I would recommend steel (not wood nor aluminum nor brass). I have a vise from brownells, and have removed even mosin 91/30 barrels with it. These would spin in the wheeler vise with wood blocks as well as spin in the brownells vise with the aluminum bushings, but it held with steel bushings. Factory Remington 700 barrels can be similar. I use the wood blocks for delicate things, like shotgun barrels. I don't use aluminum bushings anymore. Lead shims is the way to go if you need to protect the finish when removing. Lead cleans up much easier off of, a parkerized barrel than aluminum does.