I am assuming you are jesting, a .50 BMG is around 13,000 ft lb.
That is for my 17” Henry X .44 Mag carbine. It is a near max load for that bullet with AA9. You can get a little more fps with a different powder (or a longer barrel). You can calculate Muzzle Energy at any number of online calculators. Like this one.
http://www.larrywillis.com/bullet-energy.html
I used to carry a Super Redhawk Alaskan .480 Ruger (2.5” barrel) when I rode a dual sport bike in grizzly bear country along the ID/ MT border, my carry load was a hard cast flat nose at 1100 fps (subsonic) and coincidentally it’s ME almost exactly matched this .44 Mag carbine load. It was a whole lot more uncomfortable to shoot tho.
John Davies
Spokane WA