I read the Pennsylvania bill which was sponsored by (mostly) a bunch of Philadelphia Democrats. I'll wager that most of these bills have virtually the same wording. It would be very interesting to see where it comes from.
The PA bill would establish a database of every ammo purchase, shell by shell, box by box, purchaser by purchaser. To pay for all of this, there is a 5 cents per round tax. In other words, a double whammy - even if you do go through the trouble to buy it, we'll make it so expensive you just won't want to do it.
John