If memory serves, the Black Talon was a hollow point design by Winchester that came out in the mid 90's. It was kind of pre scored or cut such that upon expansion the bullet would not only mushroom but also have little sharp pointed "talons" at the end of the mushroom tips that in theory would cause more damage as it tore through it's target. The bullet was also black but that was just for cosmetic and marketing purposes. The expanded bullet did look rather "devastating" and it wasn't long before the media started hailing this as a cop killer bullet and a menace to society. Winchester received lots of heat for this and eventually restricted it to law enforcement before removing it from production altogether. However, it was just basically given a face lift. It was later introduced in the SXT series of bullets by winchester. It now had the traditional color copper jacket and had a technical name instead of the emotion stirring black talon.
SXT is kind of an acronym for Supreme eXpansion Technology. Although according to some gun magazines it's been kind of joke at Winchester that it also means Same eXact Thing, in reference to the Black Talon. That's the best I can remember for now, I'm sure some of our other more knowledgeable members would have more information. Hopes this helps.