Nimrod
I don't like the idea of putting torque on parts of the action or recoil lug be they stout or not. With a barrel vice I stick the barrel in the vice and go to town either removing or installing with my barrel nut wrench. When I say you need 100 ft lbs or so, that is just my estimate of pulling on my 1 foot long wrench with about 100 pounds of pull. So I am "hand tightening" as are you. I initially didn't tighten that much – maybe only 30 ft lbs and found that every rifle without exception would throw the first shot high and then the rest would group 3 or 4 inches below the first. Since I moved up to 100 pounds of pull, that problem went away. In fact I just got back from the range where I was shooting two of my Savages so assembled (a 260 Rem and a 300 RUM) along with a custom 338 RUM. The two Savages grouped just a hair outside 1inch at 200 yards where the 338 ran 1.5". The vertical on the 300 RUM was 0.375" so it sure isn't having any issue there. The vertical on the 260 Rem was about 0.5". To be fair to the 338, that was a first try load with the 300 grain Bergers and the other rifles loads are pretty well done being developed. I'm pretty sure that if I loosen the barrel nut on that 300 RUM and go back to the range with the same ammo that I just shot that vertical will go right back to 4 inches with the first shot being the flyer.