Well, I've always liked 4-12 and 6-18 scopes on my rifles, but I stuck a Leupold 2-7 (heavy duplex) shotgun scope on my AR a while back cause it was all I had handy.
Last week I whacked a crow in a plowed field (on 7x) at 256 long steps. 
Lots of luck involved on that shot, but a coyote-sized target at 200 yards shouldn't be a problem in my opinion. especially with a regular or fine reticle.
