Check those links.
This is third part of three parts YouTube presentation.
http://www.youtube.com/watch?v=sdKlubTRkk8&feature=related
Read this
http://www.plosone.org/article/info:doi/10.1371/journal.pone.0005330
Discussion from above study
"Fragmenting lead bullets have been in use for hunting since the early 1900s [40]. Although hunter numbers have diminished slightly in recent years, there were 10.7 million big game hunters in the United States in 2006, the majority of whom still use lead-based bullets [31], [41]. Many state wildlife agencies annually issue multiple deer harvest permits to individuals, effectively offering venison as a year-round protein staple for some families; game meat is the principal source of protein for a considerable proportion of Alaska's population [42]. Hunter-donated venison to food pantries and shelters for low income families in most states produced an estimated minimum of 9 million venison meals associated with the 2007/08 hunting season [33].
With these concerns, we anticipate that health sciences will further examine the bioavailability of lead from bullets and shot, the epidemiology of exposure, and the possible consequences among hunters, their families, and others who consume venison."
As to performance newest lead free bullets are very accurate and have deepest penetration.
Link to performance on goat is below 150 gr Barnes TTSX.
http://youtu.be/37JwmSOQ3pY
This is Barnes TSX 180 gr after penetrating 30" of MD
We only hunt with lead free bullets due to performance.
Some will follow with comments, that you don't eat wound channel,(meat for those study was processed by professional butchers and meat from donations was given by hunters that were certain that they don't eat wound channels and 30-50 % samples had lead fragments)
Others will chime in that lead kills and killed for so long.
Yes it did but lead fragmentation study are relatively new 2008 and since then I and my hunting partners use only lead free bullets for hunting.
Serving venison I know that is organic and lead free.
And for those relying on BLL Blood Lead Level
Venous BLL testing is the most useful screening and diagnostic test for recent or ongoing lead exposure as opposed to past exposures.
So it tells you nothing about how much lead is stored in your body.
During pregnancy lead might be released from storage causing harm to the baby.
I think that post mortem chemical analysis of whole body would indicate how much lead we retained/accumulated in our bodies over lifetime.