It loads 4-round clips from the side of the breech and with a skilled loader, it can really crank out the firepower.
The Soviets used them extensively in Afghanistan, mounted on top of armored personnel carriers to break up Mujahadin ambushes.
Doesn't say anything about Russian casualties.
Yes, that is a gun in question at work:
Ukrainian Artillerymen Receive Accurate Counter Battery Fire
https://m.youtube.com/watch?t=19s&v=MzuunnRuVjw
Related news:
http://freerepublic.com/focus/bloggers/3619629/posts
Khemeymim under attack: why did the Russian airbase in Syria comes under fire