Just replying to yours, because I got down voted to hell, ha ha.

But, you need to compensate about 12-16 inches at 300m with most ARs in the game. Which, depending on the optic, and how you zero it, is pretty accurate. If they allowed you to adjust your zero in game to the range, you would need to make adjustments on your point of aim/point of impact, for shorter shots. The way the game zero's your sights, is pretty much a 100m zero, so you have a nice, easy flat shot at close range, but have to deal with a big drop off.

All this being said, all of my sight adjustment, and zeroing optics experience comes from Simi auto, and full auto, 5.56, and 7.62 ar's, and lmg's. I don't have any experience with nice, long barrelled, bolt action riles really designed to reach out and touch things at 1000m+. I imagine they suffer from dramatically less drop. But, they suffer from the same zero issue that effect the ar optics, 100m zero. If you could adjust your long rifle optics depending on range, you'd be surprised how high the round would appear to arc before dropping down in the sight to find the point of aim.

So, watching rounds drop out of the base of an optic at 600m in the game doesn't really bother me, from my experience. Which is why I find it rather realistic, again, based on the short range zero all of the optics default to.