this article and the research paper is bullshit. at least with my limited access to the details of the paper because of academic greed.
they didn't even show the levels of lead found in the blood of the subjects yet they call out acceptable levels in their introduction.
they also failed to accommodate for potential false positives by not including subjects that actively hunt and eat their game. that too can account for increased blood lead levels.
yes, out of caution, wash your hands after handling ammunition. or better yet, wear gloves so the oils in your skin don't degrade ammunition while in storage.
but, in no way does this study point to an increased risk of lead based illnesses.