Generally speaking "target" arrows will be held to higher standards of straightness, weight uniformity and spine consistency that arrows intended only for hunting. Also, target arrows are generally skinnier (smaller diameter) that hunting arrows so they will be less affected by wind. In the case of the two most popular carbon/aluminum target arrows, Easton's ACE and X10, they are of barreled construction, meaning the center of the arrow is slightly larger in diameter and it tapers toward both ends. This allows even smaller diameter shafts with sufficient stiffness (spine) to be used with the range of draw weights popular for target shooting.
Hope this helps,
Dave
Hope this helps,
Dave