use an 18" scout rifle 308, with the needed 3" of flashhideer, with plain based 150 gr sp's, vs a 20" 223 with 1" of flashhider, and the new 77 gr bullet
and you'll notice that the 223 has LESS wind drift. :--) So you can't just broadly say that the 308 has less winddrift than 223. It depends upon the barrel and the load. In either case, on a vertical target like a man, if there is much wind at ALL, 1/4 mile shots with EITHER load is "iffy, cause winds can lull ,gust or change direction, once you launch the bullet, that's it. if the wind changes, you still miss, reguardless of 308 or 223 being your choice.
Is the Sierra Tipped Match King the Best Choice for the AR ever?
Product - Sierra Bullets - The Bulletsmiths