Well, it would be good if you could post links to the research of humans with elevated levels of lead in their blood from lead fragments in wild game. I'm not disputing you, but if the research "clearly shows" this, then there should be published studies you can link to.
Regardless, I am a fan of the Barnes copper bullets and have used them for deer, elk and caribou out of a .270 WSM, and on deer in my muzzleloader and .300 BLK.
Here is the North Dakota Department of Health's page on Lead in Venison. They did a study in 2009 showing an increase in lead levels for people that eat wild game shot with lead bullets. As a result of the study they issued a recommendation that children under 6 and pregnant women not eat meat shot with lead bullets
http://www.ndhealth.gov/lead/venison/
This is one where they looked at how many packets of ground venison shot with a lead bullet contain lead and then feed those containing lead to pigs. (Pigs are a pretty good analogy for people and it would be highly unethical to knowingly feed children lead to see what happens)
http://journals.plos.org/plosone/article?id=10.1371/journal.pone.0005330
One on lead level in Inuits:
http://www.ncbi.nlm.nih.gov/pmc/articles/PMC1740625/pdf/v060p00693.pdf
There are more below that you will have to hunt for the articles yourself. I haven't read them all of course but the articles I have found online show that show that shooting game with a lead bullet leaves lots of small lead particles in the meat and that eating meat shot with lead bullets leads to increased levels of lead in the blood. I haven't seen any that show the opposite, instead the argument is on the level and if those levels are a significant threat to human health. The fact that the NRA and other group opposed to banning lead bullets for hunting haven't produced any articles to the contrary makes me believe strongly that they don't exist.
Likewise the NRA could easily commission a study monitoring lead levels in hunters that consume wild game. They have a strong level of trust in the hunting community so finding a data pool shouldn't be a problem. Why don't they do this? (My opinion of course)
1. They have been successful with their current tactic of claiming banning lead in hunting is a slippery slope banning all ammunition.
2. They don't wish to create more research that contradicts their position that shooting game with lead bullets poses no health risks.
More Journal Articles:
Bjerregaard P, Johansen O, Mulvad G, Pedersen HS, Hansen JC (2004)
Lead Sources in Human Diet in Greenland Source. Environ Health Persp112: 1496-
1498. (1, INT)
Coburn, Snary & Wooldridge (2003) Hazards and Risks from Wild Game: A
qualitative risk assessment. Veterinary Laboratories Agency, Weybridge. 155pp (3,
UK).
Dewailly E, Ayotte P, Bruneau S, Lebel G, Levallois P, et al. (2001) Exposure of the
Inuit population of Nunavik (Arctic Quebec) to lead and mercury. Arch Environ
Health 56: 350-357. (1, INT)
Dobrowolska A, Melosik M (2008) Bullet-derived lead in tissues of the wild boar
(Sus scrofa) and red deer (Cervus elaphus). Eur J Wildl Res 54: 231-235. (1, EU)
Green P (2010). "Heavy metal" - recent (veterinary) review of implications for human health from lead bullets in shot deer. (Deer magazine (BDS house mag) (4, UK)
Guitart, R; Serratosa, J; Thomas, VG 2002. Lead-poisoned wildfowl in Spain: a
significant threat for human consumers. International Journal of Environmental
Health Research 12: 301-309 (1, UK)
Gustavsson P and Gerhardsson L (2005). Intoxication from an accidentally ingested
lead shot retained in the gastrointestinal tract. Environmental Health Perspectives,
113, no. 4, 491-493. (1, INT)
Haldimann, M., Baumgartner, A., & Zimmerli, B. (2002). Intake of lead from game
meat - a risk to consumers' health. European Food Research & Technology 215: 375-379. (1, EU)
Hunt WG, Watson RT, Oaks JL, Parish CN, Burnham KK, et al. (2009) Lead bullet
fragments in venison from rifle-killed deer: Potential for human dietary exposure.
PLoS ONE DOI:10.1371/journal.pone.0005330. (1, INT)
Iqbal S, Blumenthal W, Kennedy C, Yip FY, Pickard S, et al. (2009) Hunting with
lead: Association between blood lead levels and wild game consumption. Environ Res109: 952-959. (1, INT)
Jaffer, A. 2009. A scientific review of the risk to the consumer from lead shot in game meat. A report commissioned by the Food Standards Agency Game Group. March 2009 GG/12/03/4.
Abrar Jaffer, Veterinary Public Health Team, Hygiene and
Microbiology Division Johansen, P; Pedersen, HS; Asmund, G; Riget, F (2004). Lead shot from hunting as a source of lead in human blood. Environmental Pollution 142:93-97 (1, INT)
Johansen P, Asmund G, Riget, F (2004) High human exposure to lead through
consumption of birds hunted with lead shot. Environ Pollut 127: 125-129. (1, INT)
Knott, J., Gilbert, J., Hoccom, D.G. & Green, R.E. (in press) Implications for wildlife
and humans of dietary exposure to lead from fragments of lead rifle bullets in deer
shot in the UK. Science of the Total Environment (1, UK)
Kosnett M J (2009) Health effects of low dose lead exposure in adults and children,
and preventable risk posed by consumption of game meat harvested with lead
ammunition. In: Watson RT, Fuller M, Pokras M, Hunt G editors. Ingestion of Lead
from Spent Ammunition: Implications for Wildlife and Humans. The Peregrine Fund,
Boise, Idaho. pp. 24-33. (1, INT)
Madsen, H. H. T., Skjødt, T., Jørgensen, P. J., & Grandjean, P. (1988). Blood lead
levels in patients with lead shot retained in the appendix. Acta Radiologica 29: 745-
746. (1, INT)
Mateo R, Rodriguez-de la Cruz M, Vidal D, Reglero M, Camero P (2006) Transfer of
lead from shot pellets to game meat during cooking. Sci Total Environ 372: 480-485.(1, EU)
Monkiewicz J; Jaczewski S. 1990. Distribution of lead in the wild boars' carcasses is
dependent upon the distance from a rifle-shot wound Medycyna Weterynaryjna
46:187-188. (1, EU)
Pain DJ, Cromie RL, Newth J, Brown MJ, Crutcher E, et al. (2010) Potential Hazard
to Human Health from Exposure to Fragments of Lead Bullets and Shot in the Tissues of Game Animals. PLoS ONE 5(4): e10315. doi:10.1371/journal.pone.001031 (1,UK)
Scheuhammer AM, Perrault JA, Routhier E, Braune BM, Campbell GD (1998)
Elevated lead concentrations in edible portions of game birds harvested with lead
shot. Environ Pollut 102: 251-257. (1, INT)
Tsuji, L. J. S., Nieboer, E., Karagatzides, J. D., Hanning, R. M., & Katapatuk, B.
(1999). Lead shot contamination in edible portions of game birds and its dietary
implications. Ecosystem Health 5: 183-192. (1, INT)
Tsuji, L.J.S., Wainman, B.C., Martin, I.D., Sutherland, C., Weber, J-P., Dumasd, P. & Nieboerb, E. 2008. Lead shot contribution to blood lead of First Nations people:The
use of lead isotopes to identify the source of exposure. Sci. Total Environ. 405: 180-
185 (1, INT)
Tsuji, L.J.S., Wainman, B.C., Jayasinghe, R.K., VanSpronsen, E.P., Liberda, E.N.
2009. Determining Tissue-Lead Levels in Large Game Mammals Harvested with
Lead Bullets: Human Health Concerns Bull Environ Contam Toxicol 82:435–439 (1,
INT)
Tsuji, L.J.S., Wainman, B.C., Martin, I.D., Sutherland, C., Weber, J-P., Dumasd, P. & Nieboerb, E. 2008. The identification of lead ammunition as a source of lead
exposure in First Nations: The use of lead isotope ratios. Sci. Total Environ 393: 291- 298. (1, INT)
Verbrugge, L. A., S. G. Wenzel, J. E. Berner, A. C. Matz. 2009. Human exposure to
lead from ammunition in the circumpolar north. In R.T. Watson, M. Fuller, M.
Pokras, and W.G. Hunt (Eds.). Ingestion of Lead from Spent Ammunition:
Implications for Wildlife and Humans. The Peregrine Fund, Boise, Idaho, USA. DOI
10 .4080/ilsa.2009.0110 (2, INT)
Zmudzki J; Michalska K. 1992. Distance from rifle-shot wound and lead
concentrations in wild pig roe and deer tissues Medycyna Weterynaryjna 48:127-129 1992 (1, EU)