I'm looking at an example of where one tank is firing at the side of another tank with vehicle machine guns at 2". The Firing vehicle VMMG has offensive value of 0 but the AP Mods for small arms says at that range it's +1. So the final OV is 1 minus side armor of 3, giving us a -2 on the left side of the Kill Chart. At -2 there is a chance of killing the target tank if rollig a 1-4. I puposely picked the side armor so someone wouldn't say "maybe they hit the drivers vision slot".
My question is how does a medium machine gun kill a tank with a side armor of 30mm (Exampel PZIIIG with side armor of 3)? By all accounts the tank should be empervious to Medium Machine gun file.