It has never come up in my group, due to them not liking it when I go Gun Nutty. (Hell, you folks don't like it and there's fellow gun nuts here!). But I've ruled that low-lethality rounds (Gel and Stick'n'Shock) are grounds to help with cases of "Self Defense" statements, regular ammunition keeps things neutral, and high-lethality rounds (Flechette, Explosive, EX-ex, and so on) rules "Self-Defense" out as an option, and actually is grounds for "Premeditation" due to carrying something designed to be better suited to kill rather than wound. That's if it ever got to a court case, that is.
Great for a SINner and John Q. Wageslave to think about, not so good for the SINless with Forged Documents.