When I was at service we were having a live fire excercise which lasted for a week. We shot LAW training rounds etc, but most memorable thing was shooting Suomi-MP.
Its better than the russian counterpart, dunno its name, but you will recognize it if you have played CoD, its the gun with round 71 ammo magazine

First we shot 25 shots prone from 100m.. quite accurate , even with 3 shot burst (full auto whole time)
But the fun part was to shoot standing from 50m, full clips....tatatatatatata
The target was really ripping apart when keeping firing!! And the most amazing part was that I was able to keep continous fire with accuracy , so the bullets were hitting the target, not going upstairs into the sky like with new 7.62mm caliber assault rifles.
Would like to have that kind of gun with me when in close combat in trenches.
Also to be noted: all ammo was from 1944, all were tracer rounds. We shot 5000 of them and not a single one of them worked properly --> no tracers visible. Go figure..