Actually last is very much durable and not a problem in the environment. Toxicity is a problem only when lead metal is ingested. Shot or fragment quickly react with groundwater which in the US is usually high in carbonate and calcium content along with phosphorus and other components.
Oxides or phosphate coatings are actually quite resistant to acids, even in stomachs.
Usually, lead shot passes through the digestive tract of birds and mammals in less than 48 hours, short enough to not impact the external lead compound coatings.
For ranges, controlling water flow and applying amendments like TSP, or high phosphate fertilizers, quickly immobilizes metallic ionic lead and routine harvesting of fragments further reduces risk.
I wrote a madters thesis on this topic for Env Mgmt.
The panel wanted to argue with every matter of science that wasn’t included in the PC version of the narrative..
ok...but what did you think of the joke?