Well, lets see now. We are not suppose to shoot lead bullets because the fragment into all of the meat on a animal and when we eat it we ingest this lead causing problems.
All copper bullets are bad because they don't expand properly at longer distances where the velocity of the bullet isn't great enough to open up properly and result in a clean kill.
It's getting to the point now that we are going to have to start throwing rocks again.
One thing that we need to also remember is that the all copper bullets are progressing as far as their performance through the velocities that they may be shot at at a animal. What happened 5 years ago has been improved upon with the bullets of today. It seams like I read that with the Barnes bullets that they recommend velocities of 1300 fps and faster for reliable expansion, I may be wrong here since I am just going by memory
I know that my experiences is that Barnes bullets work at all viable distances that I have shot a animal at. The kudu that I shot in Africa was at 479 yards and when the skinners got to the heart they just started to laugh, it looked more like a towel that had gotten stuck in a paper shredder, even the coues deer that I shot at 420 yards didn't argue with a very good exit wound.
There are also times I wonder what would of a lead bullet of done at those same ranges? I once shot a cow elk at 20 yards and recovered the Sierra boattail bullet on the off side just under the skin, this was with a 7mm Rem mag. There wasn't much left of the bullet after it just took out about a quarter of one lung. She took a second shot at 200 yards when she turned around and looked at me.
I just like sticking with what I know works and works quite well for me.
On a side note on the above article, do you know when it was printed? I tried to find a date but didn't see one.