Did the gun actually move or just rotate?
I did a couple of tests last weekend with a single 7,5cm Pak vs 3x T-34/85 at 500 and 1000m, and the Pak massacred the T-34s when in light woods and foxholes. At 1000m the T-34s didn't stand a chance at all and at 500m the gun still got all tanks 8/10 times.
I did a few tests here, too.
And was a bit surprised by the results, actually. Test was a soviet infantry company assaulting a HMG 42 in a trench from 400m distance.
I've ran the scenario a couple of times and average casualties for the soviet force was ~ 16.
16 casualties for assaulting an entrenched HMG across 400m of open ground.
That doesn't sound right to me.
From my army days I remember that when using the MG3 we were instructed to fire short bursts (3-5 rounds) when using the "light" bipod variant and longer (20-50!) bursts when using the "heavy" tripod variant.
During one exercise I was gunner on a tripod MG3 and was engaging targets at 300-400m. The target was a "Schützengruppe", 10 targets in a lose formation. When I had fired off 2-3 short bursts the sergeant yelled at me WTF I was doing and told me to fire off a longer burst. Which I did. A 3-second burst later all targets were down.