I am against banning lead ammo, as it is the cheapest, and hollowpoint lead works great against humans; but am not at all against hunters using copper ammo.
Copper ammo works better (less jams) anyway.
We don't have enough predators and scavengers around anyway, why poison them with lead.
Most hunters, like myself, are conservationists. We want to protect and maintain nature because that is what we enjoy. Using copper ammo in hunting is just good conservationist practice for maintaining our wildlife.
In order for the lead to enter the animal's blood stream, it must dissolve first. Metallic lead doesn't dissolve in the blood-temperature hydrochloric acid of a condor's stomach. The HCl must be at 100°C to dissolve lead.
But funny that you should mention the gizzard. For those who don't know, the gizzard is where a bird uses sand, gravel, or other grit to grind up its food. The gizzard is a muscular organ that contracts around its contents and crushes them against the grit inside. When the gizzard contracts against soft, malleable lead, the lead is deformed. It then goes on to pass through the bird or is cast up with other indigestible debris. Copper, on the other hand, is much harder than lead and doesn't give. If the copper has a sharp edge, as is often the case in deformed bullets, then the copper will cut the condor's gizzard to shreds.
Also, copper is soluble in blood-temperature HCl. Copper's toxicity in birds isn't well understood, but it is toxic in high enough concentrations in other species. Until the toxicity in condors is understood, one cannot automatically say that it's OK for a condor to munch on copper.
Make no mistake: This isn't about protecting condors. It's about banning lead, and thus ammo, and thus your right to keep and bear arms.