I've shot both calibers in FTR.
An off the shelf Savage Model 12 .223 with a 28" 1:7 twist barrel shooting 80 gr A-Max and a Barnard 'P' Action .308 with 32" 1:10 barrel shooting 155 gr Scenars.
In light winds the two combinations have very similar ballistics.
In moderate winds upto 600 yards the .223 can still be competitive, higher winds at longer distances the .308 dominates.
With a heavier 185 gr projectile the .308 has a bigger advantage in heavier wind.
The .223 is a great beginners caliber.
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