I'm sure we will both catch it for this, you thinking about it and me doing it, but that is how i do mine. I give it one good whack to tighten it and another good whack to make sure the first one was a good hit. Takes 1 or 2 whacks to knock the nut loose but have been shooting my F/TR rifle for 2 years and the nut has not come loose yet. i only shoot it at matches and to foul the barrel after i clean it to prepare for the next match so it has around 1300 rounds on it since i last had the nut loose. I have no ideal what the torque is by doing it this way tho. All this is done with the barreled action laying across my legs. Nothing but my hands holding the action. I don't not hold the barrel but i do double check headspace after i whack the wrench.

Gary