I do not own a 50 BMG, so I had to look up values. But this is what I put into Strelok and what I got out...
Distance: 4101 yards (sorry, US here)
Slope angle: 0
Wind speed: 0
Wind direction: 0
Weather: altitude 112', temp 90 F, pressure 29.41 ihHg
Cartridge: bullet weight 700 grains, Ballistic coefficient (G1) 0.62, bullet speed 2978 fps @ 100 degrees fahrenheit
Vertical adjustment of 49,622.24 inches (1,260.404896 meters)
Sound speed: 1153.3 feet per second
Time of flight 19.9 seconds
Muzzle energy (out of barrel) 13784 ft-lbf
Retained energy (at impact) 68 ft-lbf
Now maybe I entered stuff in wrong for the bullet, but Stelok is a pretty standard ballistics calculator.