The human body can digest, and pass through all kinds of heavy metals-- and does -- daily, from many sources. Microscopic lead that MAY be ingested as the result of poor meat processing will not poison anyone. It is passed on through and out the body. Any heavy metal atoms that do get into the blood stream are filtered out through the kidneys, and then excreted out through the walls of the rectum.
These are alamists studies done with an anti-hunting agenda in mind-- nothing more. They tell us nothing. If these small amounts of lead were truly toxic to humans, our ancestors who depended on meat they killed, and usually with rifles or lead shot in the 18th and 19th centuries would all have died, at an early age, and we would not be here to be writing about this!
Cut around the primary wound channel. Wash the meat well with water, to remove any surface debris, including copper, steel, or lead from your bullets. I wash the wound channel, cut-away meat, and soak it in water to get the blood out, but then put it in a bowl to use for grinding up venison for sausage. As long as its been washed and cleaned, its fine.
I found that lead washes out from meat with the first rabbit and pheasant I prepared, shot with lead shot. I missed a piece of shot once, and found it when biting down at the table. The lead pellet was dark indicating oxidation had occured, but other than a bit of metallic taste there was nothing wrong with the meat. I spit out the lead pellet, and finished the meal.
With bird hunting, finding a piece of shot in the meat you eat is a relatively common event, no matter how well the meat is prepared. Sometimes, you find a hole, but just can't find the pellet that made it. It will have slide Under a muscle after slowing and sometimes hitting the breast bone.