Gee.... If they are so afraid of the .30-30 round .... why not ban the .30-'06? Or the 7mm. Magnum?
There's a pretty good list of rifle rounds that are more powerful than the 115 year old .30-30 round.
That was the intended plan with the legislation.
All rounds that could penetrate low level soft body armor commonly worn by police officer were to be banned.
Of course this includes virtually all centerfire rifle rounds and many handgun rounds.
That was the devious plan by the anti-gun author and a couple other intelligent devious anti-gunners in power.
To convince other more naive individuals to pass a ban on most ammo thinking that they were protecting police officers from a limited and unique danger. Of course many who knew better could also play dumb and act naive as well.
They did succeed in banning commercial manufacture and sales of handgun rounds (and the ATF since many rifle rounds because they are chambered in some handgun somewhere) made out of most common metals as "armor piercing" in the 80s, which probably inspired the new attempt.
THe 80s legislation limits what metals can be used to create highly affordable budget or specialty ammunition today even when they have nothing to do with increased penetration.
It also keeps ammunition in the stone age. Creating ammunition with tiny moving parts for example is not practical without using something like steel or iron.