I have used a Torqe wrench on mine and a friends , But we usually use a resized case , screw the barrel till it stops then turn the nut down . Then I open and close the bolt on a couple of resized pieces of brass . Soon as I get it where the bolt is just barly felt on closing , I peck it with a piece of brass drift a time or 2 . Can change in the stock without taking the scope off this way. It is my way and I am sticking to it. ;D