So let me review what the study says:
They raised upland birds in a farm and then released them on an island where heavy hunting and clay shooting had been going on with lots of lead on the ground. Then they shot some birds and a small to fair number had lead pellets in their gizzards. What is the surprize here?
How does this situation apply to general upland hunting?
Most of Montana is not an area heavily polluted with lead.
No news, no correlation!