It makes big boom. and is very slow to load ,,, takes many minutes as I recall.
Lotos can fire six to eight shots per minute at an effective range of up to 13 km..Not to bad, could ruin your day..
From the article:
"Lotos can fire six to eight shots per minute at an effective range of up to 13 km, as compared with the 8.8 km of its Soviet 2S9 Nona predecessor."
So at 6 shots per minute, that's 10 seconds to reload.