Dunno. But I need one.
... ah....
wiki says: Ballistics
The cartridge propels its 2,400 gr (160 g) bullet at approximately 2,100 ft/s (640 m/s).[1] This yields a muzzle energy of 38,696 ft·lbf (52,465 J).[4]
By comparison, the 5.56×45mm NATO cartridge, used in the M16 rifle, produces between 1,200–1,300 ft·lbf (1,600–1,800 J), while the .308 Winchester, a favorite for hunters and medium-range police/military sniping, produces between 2,000–3,000 ft·lbf (2,700–4,100 J) depending on the load used. The ballistics of the .950 JDJ are more similar to that of the 20 mm autocannon round, which delivers approximately 39,500 ft·lbf (53,600 J). The muzzle energy of the .950 JDJ is comparable to the kinetic energy of a 2,800 lb (1,300 kg) automobile traveling at 20 mph (32 km/h).