The 6.5 family benefits from high BC bullets in medium weight, while the 30 Cal’s needs 220+ grn bullets to get the same BC so the net is lots more recoil to get the same external ballistics, minus energy. The trend in 308 is short bbls as more folk add suppression, and the 308 gets near optimal internal ballistics from bbls in the mid length as well.
Some 140 grn class 6.5 bullets approach .700 g1, while the similar weight 30s are under .400.
Have you heard anything or have any impressions on the .224 Valkyrie ????