From what I understand after a short period of time the lead oxidizes and is sealed from any true water/lead contact. It is then reclimated (spelling?) into the gravle or sand and spread into the system. Fortunatly most of it is too large that most waterfowl cannot ingest it. if they could you could bet we would be fishing with toungsten or buismith.
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25 years experience fishing the Puget Sound. 5 years of it catching fish.