I've changed out and swapped barrels probably 8-10 times between my 3 Impacts. IIRC they torque them to 70 ft pounds from Impact, but I torque mine to 50 Ft pounds and use anti seize (USE ANTI SEIZE!) to make them easier to break loose. All my barrels have come from Impact or Stuteville Precision (Wade makes the the Impact barrels). The tolerances are really tight on the actions, and every time I take one Dasher barrel off and put another one, the fire formed brass has the same measurements - never have to adjust shoulder bump on my dies. I've used bolts interchangeably between actions to with no issues as well FWIW. I've never used go/no gauge as well.