Re: Rem 700 Barrel torque
65 ft./lbs. minimum.
It's not a matter of the barrel coming loose; it's what is happening at the barrel / receiver thread joint.
Read Harold Vaughn's book, "Rifle Accuracy Facts", Chapter 6 to see what happens at this joint when the rifle is fired and in particular when it heats up after several shots.
I use Tru-Gard barrel thread compound. It works the best of anything I've tried. You can "feel" the difference when torquing the action on the barrel.