The Ju87G Stuka uses an AP only belting, the Bf110G and Hs129 have a mixed AP-HE-HEI belting

Fact...

This will probably change for the Hs129 with the coming 4.10 patch. The Bf110 has a mixed belting probably because its meant to be hunting bombers with it, not tanks. And I doubt that Bf110s ever enjoyed the luxury of being given expensive tungsten core AP shells for tank hunting, these were exclusive to the Ju87G (and maybe Hs129)

I was waiting for someone who knew the IL2 actual belting for the Bf110 ,in this thread there are claims of 1 hit one kill with it on tanks, this confirms what I thought about the Bf110 and the loadout change that was made when Oleg put the BK 37 up level from tilted down a few degrees when it first come out in IL2, and why some attacks in a Bf110 are not instant kills because of the belting.

Also the Bf110 rear gunner reloaded the BK37 with 6 shells at a time, if the BK 37 got the correct rate of fire, 160rpm, the gunner would be loading every 2.5 seconds.