Hi 270_ Abolt. The 223 rem shoots pretty flat. If you want it zeroed at 100 yards, the bullet will still be climbing at 50 yards. 55gr bullet should be .25" low at 50 yards. 40gr bullet should be .36" low at 50 yards. Should be right on at 100, and drop about 3" at 200. HTH.
Best, Irv