In July 1863 several hundred thousand rounds of lead ammunition were expended during the Battle of Gettysburg. Most of this ammunition has lain buried on the battlefield for well over 100 years. Lead contamination of the ground water has been a concern there for a long time and it was expected to be significant.
In 1986 (123 years after the battle) the National Park Service tested wells writhing the battlefield park. Their testing revealed the following …..” No concentration of the toxic trace elements arsenic, barium, cadmium, chromium, lead, selenium, or mercury exceeds the maximum contaminant levels (MCLs)”
Bottom line is that even on a site where hundreds of thousands of rounds of deteriorating lead ammunition have been buried widespread across woods and farmland for over 123 years, there was no significant lead contamination of the ground water.
I think the concern is predators eating carcasses with lead shot and particles.
The predator is poisoned . I've seen videos of eagles unabled to control their movements because of poisoning.