There not many sockets that can handle 848 Ft-lbs. If you indeed put the much on the bolt it should had shear well before that. I don't much of anything above 300 ft-lbs. Although my impact is capacable of 900 ft-lbs working torque and 1300 ft-lbs loosening if right hand threads are involved. Most blade bolts here are 7/16 or 1/2.
