Tag & Bag

After coming up with several lethal and mass effect weapons (I have only posted descriptions of some) over the last few years, I have seen a rather futile folly in designing instruments for simple senseless killing. But as long as there is man, there will be a need for weapons, which is why I am lately turning my interests to non-lethal weapons.
We already have several different brands of less than lethal rifles which can handle large caliber subsonic ammunition used for crowd control (simply put, rubber bullets in a 12-gauge shotgun). The trouble with these weapons is that at close range, a subsonic rubber bullet will seriously injure/kill someone, but at long enough range its barely enough to bruise.
I simply propose a new type of ammunition, one which simply consists of a tightly packed powder comparable to chalk, except it would be engineered as a skin irritant. Once the bullet impacts, the bullet explodes in a puff if irritating chemicals transferring kinetic energy fit to bruise a little and spreading a little puff of "pacifying" chemicals.
Sadly, this type of ammunition could easily have the irritant replaced with a fuel-air explosive, a small taser under-slung below the rifle, and this would turn into an anti-infantry weapon much more lethal than conventional rifles.