Haven't checked my email to see if I got a response, however maybe the weapons table from the below ref will be of some help after all. Will try to find what the typical ammo load is for these three main guns shown for the newer Mi-24 models shown.
Half split or 2 to 1 ammo split on HE vs AP might yield some rough ref numbers. See what I can do without cutting into the deadline, that work starts tonight after work or tomorrow before work. It's almost like being Santa for some of these OOBs.
http://www.enemyforces.net/helicopters/mi24.htm
Regards,
Pat