Sounds like you need a Nikon p223. I have that scope on my range 223 ar. 3-12x. It has what your are looking for bdc drop in the scope as well as turrets. Mine tracks perfect every time. As far as how close depends on many factors. Mine seems very close if I shoot hornady ammo or hand loads. Those scopes are set for a specific bullet with a given speed so it will not be spot on. Anything you buy that is pre determined and not matched to your ammo will be off. That being said mine has been very close and a great scope. I shoot about 1,000 rounds a month for the last few years and have no complaints. I would just double check your chosen ammo in your gun to what distance your at that way if your a bit off you know how to compensate.