I also agree with the "no HE on autoloaders" statement. That's just wasting a clip.
Well with a skoda t-50 you can clip out a scorp g or similar with HE. But you cannot with AP. Also most high tier arty can be one shot with HE but not with AP. So for a 3 round autoloader with fast reload you are gimping yourself not carrying the HE. Same with the sp i c or the emil 1. Plenty of ammo capacity and there are times the +25 percent damage is useful.