I'm into long range shooting and hunting I currently have a remington 700 cambered in 308 with a upgraded stock and mini chassis with a vortex 6 to 24 viper pst scope I can currently hold 4 inches at 600 yards and have recently came back form a pronghorn hunt. For next year I was planing on going elk hunting but I believe that at 600 to 700 yards a 308 wont have the energy to take it down, so I was interested in buying a 338 lupua at first I was thinking about a 700 xcr but after a little reseacher I found the 700 mdt tac21. I cant find much online about it can anyone help? I know that it cost more then the xcr but it also comes with a adjustable stock and a chassis so that means I wont have to spend any more money on the gun except for a scope. Anyone know anything about these guns?