I simplified the designation quite a bit - I wanted the basics to be clear to the OP. As for HE vs AP, HE has an impact fuse and thus though it may cause a hole by the blast, it was not designed for such. AP was designed to make a hole as a primary purpose. This of course is very simplified - there are HE rounds with shaped charges, delayed fuze types of APC with secondary HE charges, etc - I really was trying to be basic and relate to in-game uses.
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