After four miles, it's a little shocking to me.
And I'm into shooting sports.
And I'm into shooting sports.
> The shot was made with a custom-built rifle chambered for the .416 Barrett cartridge
That's a huge bullet that was specifically designed for low-supersonic drag and extreme long range. It has a huge amount of energy at the muzzle... (8,767.4 ft-lb or 11,887 J according to wikipedia[1]) so ~600fps down range, even at 4.4 miles, is not that surprising.
The only surprising feat here is they managed to actually hit a target... which is quite incredible.
The .556 (very common AR round) is 112. 9mm common in handguns is around 115.
422 grain = 27.35 grams / 0.9646 ounces.
Do you mean 5.56mm, the NATO standard small arms round iirc? i.e. as an imperial measurement it'd be about the same as a .22, not .556.
Right before hitting the target it slowed down to 600 feet/sec, meaning it lost 97% of its kinetic energy during the flight.
Wow.