Im not sure if the '300 workout' has been posted online or not, but from what I read, I really doubt it. It seems like it was several weeks of various workouts and a very strict diet.
I think what most people call the '300 workout' is actually a fitness test that is accomplished by very few people under 20 mins.
Read a bit about it here: http://www.gymjones.com/knowledge.php
It appears these were the guys responsible for creating these beasts.