[robobob5000]

there are more options for shotgun shells than for bullets.

For bullets you can basically do pure copper. I think anything else falls into a 'armor piercing' category that is banned. I'm not 100% clear on the laws there but I know that is why most bullets are still lead core (in addition to cost factors).

lead ammo bans are a way to ban guns without banning guns themselves, similar to 'microstamping' and other odd proposals. Basically mandate something that makes it so costly that no one can do it