I won't bet the bank on it but I believe all small action Weatherby MK V will interchange as will all Std length MK V actions like .257, 6.5 X 300, ,270, 7mm, .300, 340 and .375. Not sure about the large action length, 30-378, .338 X 378, .378, .416 and .460. I you are referring to Weatherby MK V, Vanguard and 307 actions, the answer is no. These actions are completely different from each other.