A chart I modified to include 50 BMG and what the GAU-8 shoots. (On the A-10 Thunderbolt)
It's 139,275 FPE (not counting energy produced by detonation of its explosive warhead)
10 x that of 50 BMG
The GAU-8 can spit out 60 of these bad boys in under a second.
@Diptchip It can only fire for a few seconds or the barrels will cook. If it is on target, it should only need a fraction of that. A very weird aircraft that can take out nearly any target and take direct hits without going down. Built around the GAU and tub.