The .30-06 was adopted when the ability to kill enemy cavalry mounts (i.e. horses) on the battlefield was a legitimate requirement.
I'm not taking anything away from the round or the weapons that fire it (IMHO, I think some type of BAR equivalent should be available at the squad level), but it's a little rough for a lot of female soldiers to shoot. That's just reality.
Maybe the problem in that calculation isn’t the caliber.