https://www.theepochtimes.com/mkt_morningbrief/pennsylvania-democrats-to-propose-bullet-tax-and-encoded-rounds-to-track-ammo-owners_3881586.html

Okay, I know there are a lot of smart people in Pennsylvania, someone help me out here (even if you're not from Pennsylvania):

Let me get this straight.  You put a unique serial number on each bullet --- not the brass (or whatever), the bullet.  Let's suppose that, for a full metal jacket bullet that survives impact unscathed, such as at a shooting range --- I've had it happen --- this little number, chiseled into the jacket, survives.  So far, so good.  But what, then, about lead round nose, hollow point, frangible, and so on?  And shotgun shells?

Something tells me that these solons in Pennsylvania don't know much about guns.  And that comes as quite a surprise, as everything between Pittsburgh and Philadelphia is basically country, hills, or fairly small towns, or like the saying goes, Pittsburgh and Philly with Alabama in the middle.  Lots of good hunting up that way.

While the criminals steal guns and ammo.

Democrats are out of control.  The bad guys never register their weapons either.  It was about keeping info on the good guys who own guns.  

I may have been taking them a bit too literally.  They say "bullet" tax.  They might have in mind micro-imprinting unique serial numbers on shell casings, not the bullets themselves.  Common usage (though not among gun owners) would just refer to the bullet and shell casing together as the "bullet", which would be incorrect, but as I said, common usage among those of low gun knowledge.

Still, though, that presents a problem.  Shell casings are left behind when a shot is fired.  They either eject, as in the case of a semi-automatic, or they remain in the barrel cylinder in a revolver, until they are extracted.  Maybe that's what they're talking about.