A ‘stress-rupture life’ of 10,000 hours or longer at 1,073 K (800°C) at a stress of 400 MPa; or; A ‘low cycle fatigue life’ of 10,000 cycles or more at 973 K (700°C) at a maximum stress of 700 MPa; 3. Titanium alloys having any of the following: A ‘stress-rupture life’ of 10,000 hours or longer at 723 K (450°C) at a stress of 200 ... A 5.56x45mm round has similar muzzle energy to a .44 Magnum but is travelling at about 3,000 feet per second at the muzzle compared to about 1,450 feet per second for the .44 Magnum. Shotguns are also extremely lethal, but probably for different reasons (shot does nasty things to the human body).