It looks like it is around 200m to me!??
If he was running 950'ish....with a heavy'ish lead...it looks about right to me!

I froze the frame and had a good look it appears to be twice as far as i have ever shot!

bit stupid with the glass but good shooting!..I wonder how many shots it took though?..Most likely cut the vid.
I love this long range stuff!...Can't wait to have a go myself when i get a chance!
Interesting!