I, too shoot a .450, and off the bench used to be no fun. Ibought the Lead Sled by Caldwell (about $130.00), but worth every penny. with two 25 lbs. bags of lead shot, I now can shoot 2 boxes of factory ammo comforably. I can also sight in my 12 gauge slug gun, turkey gun and ultralight 300 WSM without pain. Any of these guns aren't too bad when shooting off-hand, but without the Lead Sled, they were beating me up. I'm 6'0 260 lbs, and no stranger to recoil, but this device made sighting in fun again!