oops, 1400 yards is a very doable anti-robot dog range, assuming your projectile/energy is adequate terminally. 300WM, 300PRC, 338 Lapua, 500BMG all have good chances of disabling this freakshow.
Now, let’s go practice!
Not much need to practice when you use EXACTO rounds. .50cal 8,000 yards
https://en.wikipedia.org/wiki/EXACTO