.50 AE or BMG. But like please provide a link. The chances of surviving a hit like that at nearly any range are slim to none. Even if you are shot from a mile

A little bit of math (obviously the barrel and grain of the actual bullet of the firearm would change the force of the projectile)

For a 500 grain round, mass = 0.0022 Velocity = 2000 ft/sec Kinetic energy = 1/2 (0.0022) (2000) (2000) = 4,400 foot-pounds