Thanks for all the replies. After looking at the specs for the Ultimate Defense line, it appears to simply be a rename of the Golden Saber. It still mentions using the Golden Saber bullet on the box it seems, just a new package. I suppose Ultimate Defense sounds more modern and more like the other brands line of defense rounds. Remington also did this a while back, renaming the many of the classic Express loads HTP - High Terminal Performance.

Critical Defense, Ultimate Defense, HST, HTP - all the names are starting to sound the same now!