regardless of whether it's legal or not, the ATF has declared a specific kind of .223 ammo to be illegal and are seizing it. The problem is the slippery slope. If they're allowed to do this, they will soon do it for another kind, and another, then our guns will be only good for clubs, because all ammo is illegal
--Proud owner of a Kel-Tec PLR-16 (.223 ammo) Link Removed
The law banning "cop killer bullets" was passed in 1986, with the support of the NRA. Possession of such bullets is not illegal. Manufacture for sale to other than military, law enforcement, or for export is illegal. Sale of such bullets is illegal (buying them is not). I cannot recall the US Code section, but it should be easy to find the specifics.
F Troop has a long history of capricious rule making. If they are going to declare .223 ammo to be pistol ammo, I would expect them to next declare SS109 ammo illegal. Perhaps we should stock up.