12.7x99 multi purpose "APHEI" by Igman (Bosnia)

So far I was unable to find this load in the Igman catalogs (sure I am lacking some) but it is also not on their website.
But the “UNIS Group” (also Bosnian) is showing this load (in the doc designated as APEI) in their catalog (not dated). And Igman is part of this group so for now it appears safe to say this is an Igman product.

Does anybody have detailed info, photos, diagrams or cutaways of this projectile?

Brian, nice!!! Thanks a lot!
Now I wonder what the special thing is, looks like a normal API at best.