I think the point being insinuated by
@finnbear270 was that swans could eat lead shot with no ill effects using an example of swans nesting near the Chester lead shot tower when he fished there as a young lad - whilst the evidence for decades is that if swans eat lead shot they will certainly suffer lead poisoning.
If you trust
@finnbear270 assertions from memories as a lad and don't trust the decades of direct experience of the volunteers of the Swan Sanctuary charity in treating swans suffering obvious lead poisoning then here is a video from WWT.
If you don't trust that here is a paper from WWT:
The health of swans in Britain is being affected by lead poisoning at lower doses than previously recognised, suggests new research by the Wildfowl & Wetlands Trust (WWT) and the University of Exeter. The study investigated levels of lead in the bloodstream and found they were related to reduced...
www.wwt.org.uk
If you don't trust that here is an article from the British Ornithological Union:
Mute Swan numbers recovered after anglers lead use was restricted
bou.org.uk
If you don't trust that here is a research paper from 1994:
Nearly 10,000 swans of six species or subspecies from 14 countries have died from poisoning caused by lead that originated from ingestion of fishing w…
www.sciencedirect.com
Nearly 10,000 swans of six species or subspecies from 14 countries have died from poisoning caused by lead that originated from ingestion of fishing weights, shotgun pellets (shot), or contaminated vegetation or sediments associated with mining and smelting wastes. Lead contamination in mute swans in England caused local population declines during the late 1970s and 1980s. More tundra swans died from lead poisoning than any other species. The extreme record involved an estimated 7200 tundra swans that died over five winters at one locality in North Carolina. The recent legislation to ban lead fishing weights in most of England and Wales and recent replacement of lead shot with steel shot for waterfowl hunting in the United States and a few areas of Europe, including Denmark, are expected to reduce the incidence of lead poisoning in swans.
If you don't trust that here is a research paper from 1990 for lead shot poisoning in swans in Japan:
We investigated the occurrence, source and exposure time of lead poisoning in whooper swans (Cygnus cygnus cygnus) and Bewick's swans (Cygnus columbia…
www.sciencedirect.com
I could go on, and you might reply to let us know your thoughts with all the above in mind.