They won't do that, however, they could make reloading too expensive with exorbitant taxes on components and do the same with ammo or magazines, leaving most with very expensive paper weights. Just look at what Cook County did regarding ammo and guns - the ammo part failed, but the gun tax was passed. All the feds have to do is enact the ammo tax. When .223 ammo costs you $5-$10 per shot, how much are you going to spend or shoot?
If Crook County can't pass a tax on ammo, there's no way in hell it'll fly at the federal level.
Also, you are over exaggerating (yes, over exaggerating). Their proposed (and failed) tax was, what, 5 cents per round? That would make .223 cost, what, 35-45 cents per round for most ball ammo? $5-$10 per shot...give me a break.
Please stop the hysteria.