Most of it is just Politically Correct Hype...When the "Black Talon" ammo first came out, there was an almost immediate backlash in the media about the name and after some experiments that indicated it was extremely effective (and damaging internally) with support by some of the 'anti-gun' doctors, it was withdrawn from manufacture...
Winchester immediately replaced it on the market with some SXT (or STX) ammo that basically performed the same, but without the coloration and name...
I still have some for my .44mag, 10mm, and 9mm, as well as a couple boxes of the old "IQ" ammo that was pulled from market the same way after it was determined that it was capable of penetrating some bullet resistant body armor...They are also up there in price....