@meerkatz, the standard 75mm on the Pz IV was delivering that accuracy in 1942. One crewman who survived Tilly stated that the 75mm was of such high velocity that you could, up to 1000m, simply put the pipper on the target and fire, knowing that the shell would strike where the pipper was pointed. They were often able to get off the critical first shot, as a result.
However, the 17lbr in the Firefly was rather a hit and miss gun. If out hit, it killed, but it wasn't terribly accurate.
The 77? Run of the mill gunners could do the business with it. It was an accurate gun easy to get own target.