For gunfights with semiautomatic weapons, I use the lowest loose die as the number of shots actually fired. Higher skill levels result in a greater chance of that lowest loose die being a 1, so you're more efficient with your killing. Untrained characters throw around tons of ammo to get a single hit.

I also have a "roll with the blow" rule - if you get hit, you drop ALL remaining sets (assuming you had at least one), fall over, and can roll Body + Vigor and get Width + 1 in light armor. Your next action must be defensive (run, parry, dodge, take cover).