For me mildots are a little coarse for the 223 to 400 yards on small targets. I much prefer MOA hashmarks or @ least ½ mill hashes (IOR MP-8,GenII ) Depending on the Mill setting and the total power you could end up with 2 MOA mildots but shooting it will tell you for fact whats what.
The fine x hair tends to get lost in the brush, tuff to see in the shadows and dusk-dawn conditions if thats a factor?
Personaly I prefer to use the reticle for most shots, the trick is getting to know and useing it. The power setting on most scopes is criticle. Another thing to consider is going with a scope and reticle you can afford or want to put on every gun, its a lot easier when they all look and work the same!
The R1, GenII(set to MOA) and MP-8(Set to 18x) are all great as the MOA hashes are easy to figure.
If you look through my six long range rigs they all look like this, it just soo much easier going from one to the other!!
Someday I'm gonna figure out how to take a good pic through the scope.