Beautiful rig Blue, sensitive question…how much ? And did you lengthen the travel on the bolt stop to allow for longer seating? If you did file the bolt stop, do you recommend shaping it to the long action so it picks up rounds from the factory(various manufacture) mags? In other words, do folks that modify the bolt stop want to take it all the way back? As opposed to just giving enough travel to pick up a round. I suppose that unless you use a factory mag with just the front modified, you would have to shorten the stop all the way.
.260 is very much in the short category – it's essentially a .308 necked down. I think I would want to have a long bolt stop and mag to allow projectiles to be seated way out and still easily fit the mag. I'm going that route with a .284 build on my .25-06 T3, with the barrel throated for long OAL.