I definitely think you're on to something there, Morg. The question is how would you translate that into a simplified game mechanic that every ten year old can apply to a character? Those values could directly effect a character's, or npc's, ability to keep upright after being hit or a creature/whatever's ability to continue a charge once hit. Also, the size of the round being directed down range could effect pinning tests and fear levels. It would be cool to see a mechanic in place to represent the terror of a newb runner having .50 cal rounds exploding plascrete and car door arounds him during his first fire fight.