Once lead is deposited in the environment, it is a very long term toxic problem, right?
That's why lead shot fired by the ton over lakes, rivers, seashores, and swamps continues to kill millions of waterfowl, right?
No... wrong. The lead is still there. It will be there a hundred years from now just like those Minie balls and bullets found on Civil War battlefields. The bottoms of those aforementioned bodies of water are frequently churned up by storms and wave action, but miraculously, the poor ducks and geese are no longer dying. The heart wrenching pictures of dead and dying birds stopped soon after they got what they really wanted. Never mind the greater crippling losses due to use of ballistically inferior ammo.
Stick to grouse hunting. The cost of ammo is insignificant.
Good advice until they come for the grouse hunters. Then what?
Most lead ammunition bans are nothing more than a scam aimed at ultimately pricing the average guy out of hunting and shooting. When interest in the shooting sports decline enough, it becomes easier to get the public to accept new restrictions on the guns too. The DNR in Iowa probably had a period for public commentary on their proposal to ban lead ammunition. It may still be worth it to contact legislators and mobilize other hunters to reverse this ban or at least prevent it from advancing to other hunting lands.
Ammunition bans are yet another good reason to join and support our NRA. Membership is as cheap as a box of most non-tox ammo. The NRA was instrumental in prompting lawmakers to prevent the recent attempt by the Obama administration to ban 5.56 m/m green tip ammunition.