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Presumably investigators could also recover traces of lead from the barrel of the shotgun and run a metallurgic comparison to lead found in a victim or at a crime scene.
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Sure they could. And they could prove what? That it was lead. Just like taking samples from your tires and comparing the rubber to rubber from tracks at the scene. Unless there is something specifically unique, they got nothing. Tread pattern, on the other hand might be unique enough for a positive match.
However, they can use that nothing to convince a jury, who knows even less.
(also, with modern ammo, the lead in shotgun shells never touches the barrel)
