Just out of curiosity, what make of rifle is it?
The action is a Weatherby Mark V six lug ultralight which had a .257SLR barrel that was very accurate. But I wanted to switch to 6.5mm so I sent it to Pac-Nor to have them chamber it and install the brake. When it came back the brake was in the package instead of installed. There is a new 'smith in town I met at the range so I figured I would give him a little business. I was amazed Pac-Nor turned the thread undersized.
The action is 1.143" diameter. There is no room to cut off the chamber end. At the shoulder the barrel measures 1.094". 1 1/2" from the shoulder it is already down to .96". This is about like a .264 Win Mag so cutting it off with adversely affect velocity anyway.
