Any mass that is 2/3 water is going to conduct electricity very well.
Personally, I don't see a problem with SnS ammo. I don't see them as mini tasers, so much as a capacitor. They hit someone, they discharge. I can see the tech side of things, and all it would really take is an advance in miniaturization of capacitors of that power level from their current size today.
From a mechanics standpoint, it is true that 1-3 shots is usually enough to drop most people (Heavily armored trolls and spirits are not 'most people'). This especially is true when getting into higher end weapons. A sniper rifle can drop someone in two shots with regular ammo, let alone going with things like ExEx, APDS, or the like. A machine gun burst will saw most people in half. SnS does the same damage, no matter what weapon it is in, which makes a nice equalizer for groups who want to do nonlethal damage. Much less problematic than, say, a Super-Squirt filled with Laes. You hit with that, and they're down, period, since the initial effect is unconsciousness, regardless of Body, toxin resistance, or whatever. And the only real defense is chemical seal, which requires full body armor. At least with SnS there's Nonconductivity, which is much cheaper and easier to obtain.