Here are some pics about the chinese 12,7mm sniper ammo and rifle.
These is the “improved” ammo using the new green case paint. The chinese change the brown color paint and used a green colored one currently, even at the 5,8 x 42 rifle ammo. The reason is unknown.
The improvement is not clear. I think it is the rubber type bullet using the semi gilding metal jacket. But the question is, make it sense to fire a non leathel bullet from a 12,7mm rifle ?? May be to prevent ricochets.