You mean the 14.5x114?Good luck on that and conformation.
They’ve been known to use a 14.7 X 114 cartridge
Since they gave us the AN-225 I’d guess they are quite capable of designing and making anything.
This particular shot….well?
Yes I did mean 14.5You mean the 14.5x114?
The round they used is the 14.5 necked down to 12.7mm/50cal.
The British sniper Craig Harrison did his hit at 2475m if I recall correctly and he did it with a 338 Lapua. So if this is a real thing the distance was stretched another 850' and used a custom 50cal.