Berger's original bullets were built using standard J4 jackets. When people started having problems with them blowing up on the way to the target (Paper or Game) in the more powerful rifles, Berger came out with the Thick Jacket or "Target" bullet.
So the original bullets are called the "Hunting" version and the newer Thick Jackets are called "Target" bullets.
The Sierra Match Kings are (I believe) built with an even thicker and tougher jacket that the Berger Target bullets, at least in my experience the SMK's stay together when the others will not.
Brian/Eric, correct me if I an wrong.
"How a politician stands on the Second Amendment tells you how he or she views you as an individual... as a trustworthy and productive citizen, or as part of an unruly crowd that needs to be lorded, controlled, supervised, and taken care of."
--Rep. Suzanna Gratia Hupp (TX)