I've got a custom rifle project that's been three years in the making already, and I finally have the last of my parts on the way now, so I decided it was time to remove the old factory barrel, but it won't come off! I've clamped it as tight as I can in my barrel vise, but it just doesn't want to stay put. The barrel on the gun starts tapering about 1/4" after the action face, so there is no parallel surface to get a solid grip on with the vise. I tried wrapping it in tape and paper, using wood and hard rubber clamping blocks, but it just won't hold still! Can anyone help me?