Well, Mildots are a reticule feature not based on any specific trajectory, but the scopes you mention do have reticule markings corresponding to bullet drop. The .223 Remington-specific BDC reticules will have the same limitations as any other BDC, though if your pet load is very similar to the calibration load or your targets are generously sized, it could be close enough over the reticule's entire range. I have an old Primary Arms prismatic scope on one of my ARs, and the BDC on it was good enough to ring steel out to 300 yards, but it almost certainly would not be good for varmints or X-rings, especially at distances much greater than 300.
I also have a Nikon P-223 scope, and it is of typical Nikon quality (ProStaff level). It sits on a Saiga in .223 Rem, so the coarser BDC seems to be right at home. For more precise drop compensation, I'd dial in with the turret, which is a nice feature in my opinion so long as it is a MOA or Miliradian counter rather than a BDC turret.
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