Question: Do they shoot a whole lot of lead shot in that part of the world? Did they look for lead pellets? My guess would be, if it's ingested lead from carrion the eagles are eating, it might be from bullet fragments in big game. But it could be from other sources as well. No indication that it's from either lead shot or bullet fragments.

Our bald eagle numbers in Iowa have increased enormously--right through the period when we were the #1 pheasant state in the nation. Lead shot and/or bullet or slug fragments might be hurting some eagles, but certainly not enough to keep the population from increasing quite steadily--at least not in this part of the world.