TexasCHLforum.com

Regarding Teflon coated bullets... you may be thinking of the KTW bullet that came out a few years before the Black Talon and was the "Original" bullet proof vest piercing bullet.

The penetrating effect had more to do with the shape of the projectile, (note it was not a hollow point) and the fact that the bullet part was solid brass; than the coating:

http://cartridgecollectors.org/cmo/cmo06dec.htm