I usually recommend a gunsmith but some folks just insist they want to do it themselves, without spending money on a jig. The method I described will work.
If the idea of grinding the lug to clear the screw results in coffee in the nose, how about the "gunsmith" who didn't know about short chambered barrels, so he ground the back off the locking lugs. When questioned, he didn't understand what he did wrong, as the headspace checked OK with the gauges. Of course the back of the cartridge case would have gotten a bit cold, sticking out in the air like that, but what the heck. (Fortunately, someone else checked the rifle before the customer fired it.)