Yes, a solid copper bullet showed few/no fragments and is less frangible.
A thin copper jacket over lead, however...the disparity in metals could cause it to slough more, and even if the "majority" are lead far and away, the samples should be adjusted, or it should be shown to be statistically insignificant. The statement that they were all counted together, even in a far less percentage, DOES affect the validity of the study.
One food that is contaminated that they let out? Take your pick...how about peanut butter? Ever seen the studies on what's in there? Dry cereal? Hot dogs? Hamburger? Chicken? Pork? Raw pork is so nasty you're supposed to wash your hands, sterilize the cutting board, and throw away the knives afterwards...trichinosis is only one of the joys of raw pork.
Now, I do not honestly know what the cost would be to go to full copper bullets. However, being in the construction industry with ALL metals going berserk, I cannot make a blanket statement that it would be pennies. Boxes of shells for .45 ACP, .38, etc. have all gone up. Steel shot went up. And I know the manufacturers will not just introduce the solid copper rounds out of the goodness of their hearts - they will pass along re-tooling costs, etc.
I will say, though, that I am looking at the shell belt full of .45/.70 rounds for my Sharps that are 405-grain solid lead flat nose bullets and wondering a little more about them. Guess I better just head-shoot the deer from now on.
Steve, I'm not against doing the right thing. I am against a rush to judgement and wasting a resource that has been helpful to many people. Where do we stop in this desire to make everything "safe"?