Re: T-28
At long range the HE of this gun has a better penetration than AP so it will fire HE at tanks.
So, in answer to your question - get closer.
Have a look at the AP calculator (WW2_APCalc.exe) to get an idea where the switchover will occur.
IF you are close, I have no idea - there is no way I know of to force a certain ammo selection.
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