as the poster above your post wrote...the 223 doesn't give up hardly anything to the 308 with 165-168 gr and the 223 with heavy 80 gr. bullets when bucking the wind.Thin Black Line said:.243 (for accuracy if you handload) or .308 (for reasonable accuracy
vs cost).
Any "22", including the .223, will drift on highly windy days at 300 yds.
If you like to spend your time guesstimating windage between
gusts and hoping if you hit the target, pick up an AR-15. If you
want better odds of actually hitting the target pick up a bolt action
in 243 or 308, or if you prefer semis a DSA FAL, Springfield M1A,
PTR, etc.