By holding the barrel you are holding the wrong end....however....when holding the action you must be very careful you do not bend the action rails. Having said that, I soak the threads in Liquid Wrench, wrap the barrel with duct tape and put it in hardwood blocks in the vise and hit the wrench with the biggest hammer I can handle with one hand. If that doesn't work....cut the nut off with a Dermel Tool.

Bill