That doesn't tell us what bullet was used... that only tells us what caliber and weight was used.

There are many bullet designs and materials. Additionally, the cartridge powder load will matter for ultra-long range shots like this too, so knowing what brand of powder, model and how many grains would be helpful too.

A shot like this almost certainly used a hand-assembled, custom round. But the bullet itself is probably "off the shelf" and so would be the powder and case too.

The exact combination might be their "secret sauce" though... long range folks get weird about this stuff.