So to provide the answers inquired upon:

1. Raptors are more susceptible to lead (and zinc) toxicity than mammals because of the method of digestion that occurs. The method of interaction between crop, stomach and digestive track is different and renders lead in a more lethal fashion.

2. The argument was about the risk of a piece of lead the size of a grain of rice being extremely dangerous or lethal to a raptor. That is true not only due to point 1, but also by the math. A male eagle weighs six pounds on average. A large hawk weighs 3 pounds on average. Lets say that a piece of lead the size of a grain of rice is perhaps 3 grams. That would be the equivalent dose of a man that weighs 300 pounds consuming 150 grams of lead. If you like ounce conversion that is 5.25 ounces of lead or 1/3 of a pound. So if you wanted to take the unscientific argument that all animals are equal, just on a weight ratio it could be like a human eating several ounces of lead which of course would not be pleasant. (but again, point 1 above, it is worse)

3. The types of lead alloys that are refined for firearms are different than naturally occurring lead and it is also different than lead used by other materials industries. The analysis on the California Condor that started all of this research was that the isotopes from the lead ingested or found in their bloodstream was munitions grade.

4. Yes. FMJ bullets go through varmints and are less dangerous. However, most bullets used for varmints are designed for a whimsical splatter that creates a rather awe inspiring shot channel. Examples would be the 17HMR 17gr hollowpoints that shatter into hundreds of pieces on impact.

5. Here is the evidence by a non-government agency run by individuals that are hunters and ranchers (that are also PhDs and biologists) http://www.peregrinefund.org/lead_conference/PDF/0104%20Friend.pdf

6. Great xray picture of lead fragmentation in a large game animal at this site if you want to see just how many grains of rice sized pieces of lead are lingering in a kill. http://www.peregrinefund.org/lead_conference/

7. More on point 2. No lead is excreted from a raptor. Birds don't pass foreign matter like a mammal. It lingers in their crop until it either regurgitates it or dies.