I'm 4 Tikka barrels into my viper vice. I have learned a little more each time. I soak in a penetraiting oil for a couple days, then tighten TF out of the vice with drywall tape on the barrel. Apply steady hard pressure on the external action wrench and apply some quick, hard wacks with a hammer. I've put marks on 3 out of 4 barrels, from not tightening the vice enough the first time. The first 3 were T3's, the last one, that didn't mark up was a T3x. Not sure if I'm just getting better, or if T3x's are easier. Torqueing on the new barrel with an inside action wrench to 80-90lbs has been easy and eventless.