Are all long actions the same(stevens) etc.I am going to build a 280AI on a long action I got here yesterday.I need to know if any long action stock will fit.I know they changed the action screw center to center distance on the short actions but dont have alot of experience with the long actions.Next,do the long actions take small or large shank barrels? Are all the bolt handles the same between short and long actions . What is the difference between a long action bolt head and a long action bolt head. Are action screws the same thread as the short actions.Thank for all your input. Jon