The drop at 200 is only 18"~20"
I would consider that a lot of drop (compaired to 5.56 zeroed at 100 yards your only looking at about 2 inches of drop). And while haveing a reflex sight on your gun helps with holdovers its harder to do with irons due to the front sight obscureing your target.
The loss of velocity at those ranges is also something to consider.
If you can do it more power to ya. I wasn't trying to knock your choice in firearms
BTW nice HK. Is that a Burris red dot on it?