It's been several years now but originally the .30 cal. carbine round was not allowed for deer in Kentucky. During the same period .240 caliber was the minimum legal cartridge allowed. Both are legal here now though.
Hard to figure how both the .30 carbine and .223 were acceptable cartridges for military issue and killed countless enemies but considered not up to par to kill a deer with.
Because, in combat, no one is concerned with instantaneous drops or tracking jobs. Often times a wounded combatant takes two stretcher bearers and/or a medic out of the action as well.
