They're just looking for ways to jack up the prices on ammo. I've even heard talk that next year they will try to raise that tax on ammunition (most likely handgun, but possibly all of it) by 1,000%. They're trying to make it too expensive to own and shoot personal weapons without actually legislating more controls and regulations.
Oddly enough, sales of guns and ammunition has gone through the roof since election day, the yguys at the shop I frequent have been having to stay several hours after closing to catch up on paperwork, especially on weekends.