Building a 280AI for my wife and a7PRC for myself. Looking at the 4.0 mag chassis or theMDT Hunt 26 . Thinking Defiance anti x action and CF Bartlein barrels in 20 or 22". These are Elk hunting rifles max shot of 600 yards for me and probably 400 for her. I know I will lose velocity at those barrel lengths but being more user friendly length is more important for us. Any thoughts on our plans?