Double edge sword in 223 of heaver verse lighter bullet.
Hence heaver bullet will help to buck the wind more, but at the same time since your dealing with low volume of the 223 case, the heaver bullet will be moving slower, so more drop to compensate instead.
As for what the bullet does once it reaches the target, that is all bullet, and if the bullet is moving fast enough to preform correctly as well.
Here, take a standard expanding type bullet, and will find that most of them needed to be moving 1800fps on impact to mushroom correctly.
So if your slinging a bullet long range for punching paper, then heaver bullet would be the trick (69gr'ish).
If the range is going to be closer to say out to 400 yards for larger varmint use/300 yards for smaller varmit use, then something like a Hornady 55gr is hard to beat. You can keep the speed up to minimize the drop, and the SP bullet performs very well at this range as well.
If your working closer up, then lighter Hunting HP/SP bullet still to keep it shooting as flat as possible.
So to sum it up, it not what you are sending down range, but if it's going to connect, and the bullet correctly preforming with dynamic shock transfer once it gets there instead.