I've rebarreled two mausers. In both cases I've had my gunsmith remove the old barrels. On my 338-06 build, I hand tightened the barrel, then got about another 1/4 turn with one of those strap style pipe wrenches. I've shot that rifle hundreds and hundreds of times since. The second rifle is a 24-47 rebarrel to 6.5x55. I hand tightened, and got about another 1/4 turn with a POS action wrench I built. Same thing, shot hundreds of times, no problems. My gunsmith claims they only need to be hand tightened. As long as they don't unscrew when you shoot them!! Obviously, you need to finish ream after barrel is installed. I'm sure there are some kind of specs. I doubt they used a "torque action wrench" when your rifle was built. Make sure you lube the threads, I use wheel bearing grease.
Good Luck
KC