The lighter bullets pretty much never do better with wind drift. They drop a little less, but we're talkin 11 inches difference at 600 yards, and only 5" at 400. At 400 to 600 yds, you have to hold over or dial with either of them, so 5 more clicks at 400 or 8 more clicks at 600 don't mean much. But, the 5-11 inches less of drop at 400-600 in trade off for more wind drift and less energy on target may be worth it for some people.
As far as wind drift, which is generally more important than drop for longer range shooting, because wind is the part your guessing, where as distance is exactly quantifiable by a rangefinder, the heavier high bc bullets will do better. You also have significantly more energy with the heavier bullets for hunting. Like 360 ft.lbs more at 400 and over 400 ft.lbs more at 600. By 600 yards the 100 grain bullet drops under 1000 ft.lbs of energy.
If your hunting deer and hogs, I wouldn't recommend going lighter than 130 with a lead core bullet. A mono, that is something else I won't go into ha ha. If your hunting rock chucks, prarie dogs, coyotes or other varmints and want the best sub 400 yard trajectory with the least holdover and most explosiveness, that is where the lighter bullets work better.
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