I'm not sure how to address the AK ballistics problem. They really seem to fire perfectly flat. I guess BIS never expected to have a rifle with good optics firing that ammo.
I have a few options:
1. Lower the magnification of the ACOG to make the weapon less accurate, because right now it's WAY too good (but lots of fun).
2. Leave the scope setting as-is, and create new AK ammo types, which would be used with my upcoming Russian small arms addon.
I like the idea of using BIS ammo, it seems more simple. But since I am planning to create new AK-74s and AK-47s anyway, I just have to update the SR-47 addon with the proper config and readme info.
Anyway, woofer, I believe you are asking how the scope is used in real life, as it has a fairly unique reticule design.
There's 6 marks from center to the bottom post, and referring to the numbers beside them (the 4 and 6), I assume is meant for aiming to 0, 100, 200, 300, 400, 500, and 600 (m or yds?).
Those account for the trajectory of the bullet (which would normally be 5.56x45mm). As I said, the AK ammo isn't realistic so those marks aren't meaningful in-game.
Since the scope is intended for assault rifles and carbines, you can expect that the operator may be facing some CQB situations. I think the torso silhouette on the scope is meant to help the operator quickly find the center of mass on a close-range target. Get the shape around your target and you are guaranteed to get a shot into the vitals.
I tried to size the reticule so that shape would be useful against targets that are about 10-20m away, good for CQB in the small cities of OFP.