How does the size of the bullet have anything to do it being poisonous? I'm not shooting Deer with Wolf or Bear surplus shit ammo as I dont trust it accuracy wise past 100 yards. I've also never heard anything about "poisonous ammo". You can find quality hunting rounds in any caliber and its just a matter of how well you clean your animal after you shoot it to get the little fragments of the bullet out.
Its worth mentioning that more people are struck by lightning and killed by blunt force objects each year than assault rifles. Handguns are responsible for the vast majority of gun related deaths. And its not "assault hand guns", its all kinds of handguns. They are easy to conceal and are much better suited for killing people then "assault" rifles. Sure they look scary and whatnot but their size (along with any full sized rifle for that matter) just make it so they aren't ideal for killing people in most situations since you cant conceal them.
I love guns and they are fun as hell but it's that very very small majority of people that intend to do harm that can potentially ruin a privilege that the majority of people in the US enjoy responsibly.